Appalling. I had a non-working boiler, contacted ERG for rapid service. Agreed next day visit. Next day they rang to say they couldn't make it, rearranged for the next day. Next day, same thing happened. Eventually this "fast response" company arrived on the fourth day after calling them. It then got worse. The engineer noted (correctly) that the batteries in the thermostat needed replacing and after replacing them concluded that the remote thermostat was not communicating with the boiler, and advised me to get a new receiver. He disconnected the wiring loom to the internal boiler clock and seemed very unclear about what he was doing. At one point I had to download a YouTube video to show him how to reset the receiver. For this I was charged £150. I got a new receiver, fitted that plus the new batteries, and still the boiler didn't work (it was working for hot water and firing up on demand, so the issue was clearly the thermostat/timer controls). I tried to get ERG to attend again because they hadn't fixed the issue, their customer service agreed two possible dates and their engineer would contact me to agree times. Not a peep - no communications at all. I then got a local firm to come out and their engineer arrived next day and took only 15 minutes to identify that the fault was that the internal timer on the boiler had been turned off. He turned it back on to continuous operation and the boiler roared into life. Problem solved. I then complained to ERG for their tardiness, their lack of competence, and that I had paid out for a new receiver (not needed) and another engineer. They rejected my complaint, their engineer said that he had not advised me regarding the receiver (it was actually noted on the invoice) and that he had made two visits (he had only made one). I am now taking them to court.