Peter Earles is a very good gas safe engineer/plumber/bolier etc. He's your man if you need pipework doing and hooking the thing up etc.
However, what I think you may actually need is someone who mends appliances?
Anyway, I'd start with Peter — his number is 07958 789188
If you need an appliance repair then I'd go to Azam / Appliance doctor 07904 327430.
Rob Reynolds ● 1939d