ERG's plumber wanted to charge £747. Another plumber fixed the problem for £30. My central heating wouldn't work. ERG arranged for a plumber to visit one morning. The man finally arrived the following day in the afternoon. He said the hot water cylinder had a faulty valve. Replacing it would involve three hours work to drain the whole system down. Total cost, including his callout fee of £150 for a ten-minute inspection, would be £747. I tried another plumber. He fixed the problem by pressing a button on the boiler to reset the code. Charged me £30 for his visit, which also lasted only 10 minutes. I want ERG to refund the £150 I was charged for the first plumber's visit. No response so far.