It can be a good idea to get a rough spec sorted out before you contact people and I'd of thought the guys on here can help with that.
e.g. Maybe the Glow-worm boiler is no good (or maybe it is ....?). I had something similar with a guy that only installed Baxi's... He had a deal going with the manufacturer
e.g. Maybe the Glow-worm boiler is no good (or maybe it is ....?). I had something similar with a guy that only installed Baxi's... He had a deal going with the manufacturer