Craig gave a few extra suggestions to what I originally was after and was at great pains to ensure I understood what was involved. Craig turned up when he said and I was happy to leave him to it while I went to work. A burst radiator as he was packing up to go was swiftly dealt with and he will be back to replace it. (It was an old rad part of the original system, Craig was only replacing the boiler; I might have to get him to replace all the radiators as well now!!) Have now asked him to quote me for some work in the bathroom. Would happily recommend him.