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Solar Power System Repairs

Established in May 2007, we are one of the longest serving and most experienced renewable energy companies around, we've carried out all sorts of repairs involving most types and size of solar PV system, so if you have a fault with your solar PV system call us on 0330 345 2800 or contact us by email or web form and we will be pleased to help get your system back up and running.

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Below we highlight some common situations and electrical faults found in solar PV systems and describe how they are resolved:

Are my solar panels working?

How do I know if my solar panels are working?

There are a couple of non technical ways to find out if your solar panels are working:

  • At your inverter: Your inverter sits at the heart of the system and is the piece of equipment that converts the DC power generated by the solar panels into AC power for use in your home and export to the grid. The vast majority of inverters have LCD displays on the front which will show the status of the system. If the solar panels are working and your inverter has a display, it will likely show you here. Common measurements that are displayed are 1) The DC voltage from the panels 2) The Current measured in Amps from the panels 3) The overall power measured in Watts being generated by the panels. 4) Often the mains voltage will also be measured and shown on the display. Inverters are usually around the size of a small TV or a microwave oven (there are pictures of inverters further down this page), if you can't find the inverter in the house, these are often installed in loft spaces and adjoining garages.

  • At your generation meter: The generation meter is a small piece of equipment (picture further down this page) that counts the solar power that is being generated. Common places for these to be installed are 1) Near to your consumer unit/fuse box 2) Near your mains power meter (which can sometimes be outside in a box on the side of the house) 3) In the loft space, if this is where the rest of your solar equipment has been installed. If your solar panels are working, this meter will count the power that they generate, this power is measured in kWhrs and you will see the numbers increase on the display.

Inverters and Generation meters aren't always installed in convenient locations. The good news is that if you would like to keep a closer eye on what your solar PV system is doing but don't want to move everything, this can often easily and cost effectively be achieved by either installing a comms device into the inverter which will then provide data to your laptop/PC/smartphone via a network cable, GPRS or wireless.

There are also devices that can take readings from the generation meter, and devices that can take readings directly from the power cables using sensors. The results such as overall and current power production can then be displayed on your smartphone, laptop, tablet or PC or a handheld or wall mounted display.

If you are interested in finding out more, then call us on 0330 345 2800, or send us an email or a message; tell us about your system and what you would like to achieve and we will let you know your options.

Repair SMA Inverter



Repair Power One Aurora Inverter

Solar Inverter Faults and Warnings:

The inverter is the most intelligent and hard working part of most solar PV systems and can stop working due to the presence of any number of faults. These could be faults within the inverter itself or as a result of the inverter safely shutting itself down after identifying a discrepancy elsewhere in the system such as from the solar panels, the mains or in the integrity of the wiring.

If the display on the inverter (assuming it has one) is still functioning, then the first place to look for a clue as to why the system isn't working correctly can be found by looking on the inverter's display and noting any warnings and or fault codes and then looking up these fault codes:

Please feel free to contact us on 0330 345 2800 if you'd like help with identifying your inverter's make or model number, if there is no display visible, for assistance with locating manuals and or in understanding what any fault codes mean.

Solar PV System Restart

Temporary Solar Inverter Faults: Safe Shutdown and Restart

The vast majority of Solar PV Systems installed in the UK (and nearly all of those associated with a Feed in Tariff) will have been installed in such a way that would allow the owner/operator to safely Shutdown and Restart the solar power system without an engineers assistance.

Instructions should be displayed on-site outlining how to do so, often placed either near the inverter or near the consumer unit, sometimes these instructions can be found in the paperwork provided with the solar PV system. If after assessing the situation, it's appropriate and you feel confident that you can do so safely, shutting down and restarting the system is often all that's needed to clear temporary inverter faults.

If a shutdown and restart doesn't clear the fault then the inverter might give you a clue as to what is wrong on the inverter's display. Note any warning messages, lights, error or fault codes that appear on the display.


Solar Inverter Identified Faults

Sometimes inverters shut themselves down as a safety measure after identifying a fault or finding itself in what it assesses to be an unsafe condition to operate in. This could be anything to do with the power system including integrating with the mains power network (the grid), the earthing system, batteries (if connected), related to the solar panels or if when tested, no fault condition exists, a faulty inverter.

Working with fault codes and the manuals will often give us a clue as to what to look for but faults like these if they persist will often require an engineer's site visit to diagnose and fix. You can book an engineer by either calling us on 0330 345 2800 or sending us an email or a message.

Solar Inverter Relay Faults

Solar Inverter Relay Faults

Relays are electronic switches that control the flow of power from the solar PV system into your local power system and the mains, they are either open or closed. Relays will not allow power through until the inverter deems it safe to do so. If a relay or series of relays is damaged or faulty the inverter won't be able to connect to the electrical system.

You may have heard your inverter 'clicking' when the sun comes up in the morning and the solar PV system turns on. If you have noticed this, then what you would have been hearing is these relays. Given that these relays open and close daily, relay faults are a reasonably common inverter fault. Unfortunately this often means that a replacement inverter will need to be installed to get the system working again.


Solar Inverter Warranties:

If a fault is found to be within the inverter, most solar PV inverters are provided with a 5 year manufacturers warranty, occasionally longer and sometimes extended. The good news is that even if your original installer is no longer trading, your inverter hardware if purchased within the last 5 years or within it's manufacturer's warranty period, assuming that the manufacturer is still trading, is still likely to be covered by this warranty.

Warranty Claims: Some manufacturers use their own engineers to service warranty claims, some will ask clients to arrange for the testing of the unit to prove the fault and arrange for the return. We can provide as much or as little help as is needed in order to process a manufacturer warranty claim and will be happy to carry out any testing or commissioning work on your behalf.

Out of Warranty Inverter Failures: If the inverter has failed and it is out of it's manufacturer's warranty period then it will either need to be replaced or repaired. We can help with either option and will provide all the information we can to help you decide the best way to proceed.

Solar PV Inverter Repair

Can solar Inverters be repaired?

Solar inverters can be repaired; but the nature of the fault, the availablity of spare parts, the status of the original manufacturer and the overall build quality of the inverter will determine whether or not a lasting repair is viable.

We have ongoing repairs and fault finding experience with most of the common inverters installed in the UK, so if you would like to discuss a repair, in the first instance call us on 0330 345 2800 and tell us what you know about the unit and the fault.

NB: Residential inverters are rarely worth fixing, once all the typical repair costs are factored: 1) uninstall the unit: 2) deliver it to us in Swindon/Torquay, 3) make the repairs and or source and install any needed parts, 4) deliver the unit back to site, 5) reinstall the unit and recommission the solar PV system.

New inverter costs are just a fraction of what they once where and in general modern inverters (the ones we use anyway) are of a much better build quality than many of the older units. Investing in a good quality new inverter with a strong 10 year warranty, in our opinion is usually the most sensible decision a homeowner can make when faced with the decision to repair or replace an inverter.

Solar PV Generation Meter

Solar Generation Meter Not Working

No Display: If the display of the solar generation meter has stopped working than either 1) The generation meter is broken and will need to be replaced 2) There is no power getting to the unit.

Display Works but Doesn't Count: If the display works but doesn't count than either 1) The generation meter is broken and will need to be replaced 2) There is no power getting to the unit to be counted being provided from the solar system.

Generation meter replacements are a relatively inexpensive and common repair but sometimes what appears to be a faulty generation meter can be an indication of faulty or damaged wiring elsewhere. In either case we would advise that you call us on 0330 345 2800 and book an engineer who will fully inspect and test both the AC and DC sides of the solar power system and then make recommendations.

Solar PV Earth Faults

Solar Ground Faults, Earth Faults, Isolation Faults, ISO and Riso Faults

These errors are picked up by inverters or through testing when during normal operation of an inverter, a leakage current to ground/earth is detected on the DC side of the system, although it is also possible that the inverter generates an alarm message due to AC leakage currents connected to the capacitive nature of the photovoltaic generator compared to ground/earth. For as long as the situation persits then the inverter will not startup. Earth / Ground Faults (also called Iso or Isolation Faults) often present themselves when it is raining or at times of high humidity when moisture can enter the system. These faults often clear when conditions improve but they will not get better by themselves, potentially becoming more dangerous over time. If your inverter picks up these faults we would advise that you book an engineer to carry out a full system test, identify the source and rectify the fault as soon as possible.

Solar Panels Trip RCD

Solar Panels Trip RCD, Nuisuance RCD tripping, RCD trips at solar system startup, RCD trips when it's raining and the solar PV system gets wet

This situation can come about from a number of different possible faults, as well as from errors made during the initial installation. Often this fault presents itself a number of years after the system was initially installed. So what's going on? There are a few possibilities:

  • There is a genuine fault to earth, either from the DC side of the solar PV system including the panels, cables, connectors and any junction boxes, from the inverter or from the supply cable to the inverter that is finding it's way back to the RCD and causing it to trip.
  • There is a minor fault somewhere else on the main electrical system that in combination with the sometimes expected capacitive discharge current from the panels (enhanced in wet conditions) going to earth that in combination are enough to cause a shared or sensitive RCD to trip.
  • There is a problem with the incoming mains supply that is causing the RCD to trip.
  • The RCD is faulty or of a low quality i.e. tripping at a value much lower than their rating.

The solution will be found after a complete test and inspection of the whole solar PV and electrical system has been carried out. Problem DC cabling and connectors that have corroded are quite a common reason for RCDs to trip like this (particularly when wet), ageing inverters and sensitive RCDs that protect both the house circuits and the PV supply cable are also common causes for this fault.

Low Solar DC Power

No DC Power

If the inverter appears to be working correctly but is not registering any DC power then make sure any and all DC Isolators (often grey, rotary style isolators are used) are switched 'On', some inverters also have built in DC Isolator switches, look around and on the underside of the chassis and make sure anything labelled DC Isolator is switched 'On'. If the inverter recognises the AC side of the system but not the DC and everything is turned on then there could be a problem with either the inverter, the panels, the cables or their connectors. Best advice would be to turn any available isolators (AC and DC) 'Off' and book an engineer to test the DC side of the system.

Mastervolt Sunmaster Inverter Faults

Solar Systems not generating enough power

There may be an issue on the DC side of the system which might include inverters, isolators, circuit breakers, combiner boxes, the solar panels and the associated cabling and connectors between them. You should ensure to check visually if everything that you would expect to be is turned 'On' is on. NB: If you find automatic safety devices such as circuit breakers or RCDs are 'Off' then there is likely a very good safety reason for this, leave them 'Off' until the system has been tested.

There may be an issue on the AC side of the system which includes the inverter, any isolators, the generation meter, any consumer units/distribution boards connected to the solar power system, RCDs and circuit breakers and the associated cabling between them. You should ensure to check visually if everything that you would expect to be is turned 'On. NB: If you find automatic safety devices such as circuit breakers or RCDs are 'Off' then there is likely a very good safety reason for this, leave them 'Off' until the system has been tested.

There could be an environmental issue, has there been any changes to the installation area? Has there been any building work carried out nearby? Have trees grown taller and increased the level of shading on the panels? Are the panels excessively dirty?

Assuming a succesful safe shutdown and restart had been carried out, the inverter was not showing any errors and all safety devices such as MCBs and RCD were in operation we would need to provide an engineer to fully test both the AC and DC sides of the solar power system before making any recomendations.

Solar Panel Replacement

Damaged and Faulty Solar Panels - Solar Panel Replacement

If any solar panel is damaged or faulty then in most systems (those where panels are wired together in strings) there is a good chance that the solar PV system will see a significant reduction in overall power generation. A damaged or faulty solar panel can't always be seen but it can be identified through testing. The ideal fix is to replace the panel with a correctly specified and well sized new one or to rewire in order to exclude the damaged panel.

Can solar panels be repaired? If the glass has been broken then the panel is no longer viable and should be safely removed and recycled. If the damage is to cabling or a faulty junction box then there is a good chance that these could be replaced/repaired and the panel recommissioned.

The information we are going to need to be able to quote for this work is the make and model of the damaged panel, this will often be with the solar PV system paperwork and always listed on any MCS certificate; and if possible, a wide angle picture of the location, that shows the damaged panel in situ, and also how the panel might be reached. please email any relevant pictures and documents along with your enquiry to:


Solar Power System Testing, Servicing & Maintenance

Regular solar PV system testing, servicing and maintenance will extend the life of your solar PV system and ensure that solar panels are always operating safely and at their best, whilst maximising yields.

We offer complete safety and performance testing for solar PV power systems of any size. Includes panels, cables, inverters, isolators and mains connections.

We provide solar power system testing and maintenance services for residential, commercial, industrial and agricultural clients across Southern, South West England and the West Midlands, with specialist experience working with farmers, developers and commercial and industrial buildings owners.

Solar Power System Testing, Servicing & Maintenance


Solar PV Inverter Replacement

If you have a faulty inverter, we offer an efficient, value for money, hassle free inverter replacement service. We offer good advice and install quality equipment with comprehensive warranty and support options. We will test the rest of the system as part of the service, take care of all hardware deliveries, record your new unit's serial number and confirm the warranty details with the manufacturer.

Our engineers work cleanly and will dispose of any unwanted boxes, faulty equipment and packaging.

Many modern inverters can now use wireless home networks to transmit solar generation data to PCs, tablets and smartphones, so if you would like something like this, let us know and we will be happy to set it up as part of the installation.

Solar PV Inverter Replacement


Further reading related to testing and repairing solar photovoltaic (PV) systems.

ABB / Power One Aurora Inverter Faults and Repairs

Power One, at one point were the second ranked inverter manufacturer in the world and there are many Power One Aurora Inverters installed in the UK. The most popular models being the Uno PVI-3.0-TL-OUTD and the Uno PVI-3.6-TL-OUTD.

Fronius IG / IG Plus Inverter Faults and Repairs

Fronius IG and IG Plus series inverters have LCD displays on the front of the chassis that providing it's working, will highlight any errors with the inverter or the solar PV system that it runs.

Mastervolt Inverter Faults and Repairs

Mastervolt Sunmaster and the smaller Soladin ranges of inverters were widely installed in the UK between 2011 and 2014. Popular Sunmaster models being the Sunmaster XS2000, Sunmaster XS3200 and the Sunmaster XS4300.

SMA Sunnyboy Inverter Faults and Repairs

SMA Sunnyboy Inverters have been widely installed in the UK, some of the most popular being the SB1200, SB2000 and SB3000. High frequency models include the SB2000HF, SB2500HF, and SB3000HF. Transformerless models include the SB3000TL and the SB3600TL.

SolarEdge Inverter and Optimser Faults and Repairs

The SolarEdge system is unique and in our opinion unrivalled in terms of it's ability to monitor system performance down to panel level. This is achieved through the installation of a small unit called an optimiser.

Sonnen Macht Inverter Faults and Repairs

The problem we often find with these inverters are damaged relays, the tell tale sign of a relay failure is an Error 19: Relay or Error 19: Relay Fault warning displayed on the inverter's display.


What Our Customers Say

"Inverter broke down, contacted Glen, on his advice new inverter delivered within days. Glen then came and fitted new inverter within 90 mins, works perfectly. Glen is very friendly very efficient, really knows his work. Can highly recommend Glen, any other problems with solar system and Glen will be the one I call." - Carl Tyler, Salisbury

Recomendation via Google

"I spoke to Glen as my inverter was coming to its end of life (10 years). Glen quickly appraised me of the many different inverters that I could use. I selected a similar SMA type. The next week Alex replaced it with a new inverter with WiFi connectivity. Everything is working perfectly (thanks Alex) in-addition I can now view my information through the Sunny Portal. A BIG thanks to Glen and Alex, superb service, highly recommended!!!!!" - David Powell, Worcester

Recomendation via Google

"Rang In Balance energy after been let down. Scott was very helpful after explaining the problem. Explained everything to me. Sent a quote within a day. Arranged an appointment that suited me. Arrived at the time quoted the engineer was very polite. Explained everything again and sorted the problem... I would highly recommend this company for solar panel repairs.. And if needed again won't hesitate to contact them. Also the quote was for a brand new inverter. But as this wasn't needed only got charged for the work that was done.. Excellent service. Thankyou so much." - Julie Temperton, Gilberdyke

Recomendation via Google

"What a pleasant surprise. I found InBalance via Google when the inverter on my solar PV system failed and I was trying to find someone knowledgeable and reliable to fix or replace it. My first impression was that the comprehensive information on their web-site was a good start, far better than the web-sites of most of the shysters who now seem to fill the world of solar PV. The next positive was Scott of InBalance's rapid response, first to my initial enquiry and subsequently to visiting to analyse and report on the problem and then removing and replacing the inverter within just a couple of days. I hope I don't ever have another problem with my solar PV system but, if I do, the first people I shall call will be InBalance. Outstanding service and thoroughly recommended." - Tim Petty, Ilminster

Recomendation via Facebook

"We had been let down by a failure on our system,and the manufacturer of the part was no longer trading. We called Glen during the afternoon and he was there in the evening. He examined the system and recommended a replacement manufacterer, promising to come back and fit in the new part once it arrived. We informed Glen of the arrival on a Friday PM, he was there fitting the new part by 10:30 on the following Monday. Of course it worked. That is what you call service, and guess who is looking after all our requirements in the future. Highly recommend this company." - Gill Spencer, Newbury

Recomendation via E-Mail

"Yes, thank you! The Inverter appears to be working well. Scott was very efficient and courteous, he couldn't have been more helpful. Thank you very much for your prompt and efficient service, apart from the expense (not your fault), it has been a pleasure working with you." Tracey Smale, Dartmouth

Recomendation via Facebook

"In Balance contacted us promptly after we made an enquiry, Glen telephoned and arranged to visit our property to identify the fault, he arrived the following day! Brilliant as when the system is down it isn't earning us money. We decided to have a new inverter installed as our original one was 9 years old. Glen ordered the unit which was delivered to our property he then arrange to fit the unit the following day. He really could not have done it any quicker so thank you for that. Good job done for reasonable money. Highly recommended." - Geoff Thomas, Abingdon

Review via Google

"Contacted Glen after being let down by 2 companies. He visited promptly, researched my system and assisted me with getting my solar system up and running again. Amazing man. Will definitely be my first and only port of call for any future issues. Friendly, supportive, knowledgeable and reliable. Highly recommend him." Margaret Bissett, Chisledon

Review via Google

"Can't recommend In Balance Energy and Glen enough. I had a fault in a solar tile that needed tracking down. Other companies did not want to know as too much hassle. Glen saw it as a challenge and was all over it. Problem fixed and full power restored. Well done and thanks." Paul Rodwell, Wallingford

Recomendation via Facebook

"We were very relieved to find Glen when our Solar Panel system stopped working, as our original supplier had gone out of business. We cannot praise Glen's persistence enough as he thoroughly reviewed the system to identify the faults and repair it, despite the searing heat of last summer. He also talked to Solar Edge and provided fault data to enable us to get a replacement part under warranty. Many thanks Glen for getting us up and running again!" - Jane Pearce, Highworth

Review via Google

"Very reliable company and very good & honest staff" Virgilo Verallo, Bath

Recomendation via Facebook

"Excellent service. We contacted Glen when our solar PV system stopped working. His response was prompt, he explained all we needed to know and got the system up and running after just a matter of days. Glen was friendly, professional and most of all reliable and we would have no hesitation in highly recommending him." Fran Armstrong, Market Lavington

Recomendation via Facebook

"Glen was very helpful and very reasonably priced. I would recommend him, and use him again in future if I need any solar work." Venu Jega, Highworth

Review via Google

"Very efficient reliable company. Scott was the engineer who attended to fix my solar breakdown, which he did very quickly and reasonably. Would recommend very highly." Paul Slatter, Ivybridge

Review via Google

"Outstanding. Conscientious, thorough, friendly and reasonably priced service. Highly recommended. Made our solar panel battery system safe, correcting the sub-standard work of others. Will always use this trustworthy PV electrician. Even after the work was completed, he studied the manual for our system and assisted with resolving further problems. Thanks Glen." Rob Barnes, Royal Wootton Bassett

Review via Cylex

"Very decent with a helpful attitude and expert in the technical side and reliable too. Had to integrate with our roofers to use their scaffolding before and after their work to take down and reinstall our PV panels. Helpful scheduling. Up and running again to our satisfaction at a decent price." David Ballard, Ramsbury

Review via Google

"I got in touch with Glen as our old converter was no longer working due to its age (9 years). Glen quickly diagnosed the inverter and tested the solar panels. The next week replaced it with a new inverter with WiFi connectivity. Everything is working again perfectly and I can see what power it's generating on a phone App now. Great service!!" Peter Dowsett, Chippenham

Recomendation via Facebook

"Glen replaced our inverter. Excellent honest guy. We wouldn’t deal with anyone else highly recommended." Nicola Moger, Devizes

Recomendation via Facebook

"Our inverter failed and as our installer had gone out of business did not know what to do. Contacted Glen who was brilliant. Came out checked the failure dealt with the manufacturer and all aspects of the warranty claim.New inverter received under warranty and Glen came out and fitted the new one straightaway. Superb service from a very professional and helpful person. Highly recommend this company." Martin Brailey, Wokingham

Review via Google

"Had a tricky fault on my (8 year) old system which Glen narrowed down and has now sorted at a very reasonable price. We have also had our faulty inverter replaced by In Balance; would recommend if he covers your area!" Peter Nobes, Bath

Recomendation via Facebook

"My inverter failed and Glen very quickly got my system up and running again. He was very professional but explained everything to me. Many thanks Glen and I've already recommended him." Di Foxwell, Wroughton

Recomendation via E-Mail

"New meter doing the business nicely. Good job, great service and friendly with it. Our thanks." Richard Illsley, Marlborough

Areas Served:

Swindon: Abingdon, Aldbourne, Andover, Banbury, Basingstoke, Bath, Berkshire, Bicester, Blunsdon, Box, Bracknell, Bradford on Avon, Bristol, Burford, Calne, Camberley, Carterton, Cheltenham, Chippenham, Chipping Norton, Chipping Sodbury, Cirencester, Corsham, Cricklade, Devizes, Didcot, Evesham, Faringdon, Fleet, Gloucester, Gloucestershire, Hampshire, Henley-on-Thames, Highclere, Highworth, Hook, Hungerford, Keynsham, Kingsclere, Lambourn, Lechlade, Lyneham, Maidenhead, Malmesbury, Marlborough, Marshfield, Melksham, Minety, Newbury, Oxford, Oxfordshire, Pewsey, Purton, Ramsbury, Royal Wootton Bassett, Salisbury, Shalbourne, Slough, Stow, Swindon, Tewkesbury, Thatcham, Trowbridge, Wanborough, Wantage, Warminster, Wiltshire, Winchester, Windsor, Witney, Wokingham, Worcester, Wroughton and Yate.

Torquay: Babbacombe, Bantham, Barnstaple, Bideford, Bodmin, Bridgewater, Brixham, Bude, Burnham-on-Sea, Chard, Cleveden, Cornwall, Crewkerne, Devon, Dorset, Exeter, Exmouth, Frome, Glastonbury, Holsworthy, Honiton, Ivybridge, Kingskerswell, Launceston, Lyme Regis, Lynton, Marldon, Minehead, Newquay, Newton Abbot, Okehampton, Painton, Plymouth, Salcombe, Seaton, Sidmouth, Somerset, Street, Stroud, Taunton, Tiverton, Torquay, Totnes, Wellington, Wells, Weston-super-Mer, Weymouth and Yeovil.

Derby: Ashbourne, Ashyby-de-la-Zouch, Bakewell, Beeston, Birmingham, Burton upon Trent, Buxton, Cannock, Cheadle, Chesterfield, Coalville, Congleton, Corby, Coventry, Crewe, Derby, Grantham, Kettering, Leek, Leicester, Lincoln, Long Eaton, Loughborough, Macclesfield, Matlock, Melton Mowbray, Newark-on-Trent, Nuneaton, Oakham, Peterborough, Sheffield, Sleaford, Stafford, Stamford, Stoke-on-Trent, Sutton Coldfield, Sutton-in-Ashfield, Swadlincote, Tamworth, Telford, Uppingham, Uttoxeter, Wigston, Wolverhampton and Worksop.

York: Barnard Castle, Barnsley, Beverley, Boroughbridge, Bradford, Bridlington, Burnley, Castleford, Darlington, Doncaster, Driffield, Easingwold, Goole, Halifax, Harrogate, Hartlepool, Helmsley, Hessle, Hornsea, Huddersfield, Hull, Keighley, Leeds, Malton, Manchester, Market Weighton, Middlesborough, North Yorkshire, Pocklington, Pontefract, Ripon, Rotherham, Scunthorpe, Selby, Sheffield, Skipton, South Yorkshire, Stockport, Thirsk, Wakefield, West Yorkshire, Wetherby, Whitby, Withernsea, York and the Yorkshire Dales.

East London Basildon, Barking, Bexley, Blackheath, Braintree, Brentwood, Brixton, Bromley, Burnt Oak, Canvey Island, Chatham, Chelmsford, Cheshunt, Chigwell, City of London, Croydon, Dagenham, Dartford, Dulwich, Edgware, Enfield, Essex, Gravesend, Grays, Greater London, Grenwich, Harlow, Hatfield, Hertfordshire, Hornchurch, Ilford, Kent, London Docklands, Maidstone, Mill Hill, Orpington, Peckham, Rainham, Rayleigh, Rochester, Romford, Sevenoaks, Sidcup, Southend-on-Sea, Stoke Newington, Stratford, Tilbury, Waltham, Walthamstow, Westminster, Wickford, Woodford and Woolwich.

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