Terrible off hand Cockley service I wast sent an electrian who said plug was good just by looking at it and quoted £2,200.00 to replace heater I had anothe engineer in to look at my economy 7 heater. It was taken apart elements tested nothing wrong but when testing the plug there was a natural but no live. Changed plug heater worked.Took 6 phone calls and had to send an invoice showing the work carried out. Then had to telephone again before getting money back.They diagnosed wrongly as didn't test the plug and then tried charging me for a new heating!!! Diabolical. Do not use this service they contract out so you have two company's involved !!!