John tried to nurse my old boiler and was willing to go on trying to repair it, but I took his advice and replaced it. He did the work very promptly, was efficient and cleaned up. The boiler had been built into a cupboard which needed partially dismantling then screwing together again. He was cheerful throughout. The boiler has worked well ever since. I have used John for all my flat's plumbing (if I can) and he put in my bathroom which is now 9 or 10 years old and still looking good.