Heating and domestic hot water

[Fred]

Any English "plumber" who says he can do the work but doesn't feature on the official list should be avoided like the plague.

Very good advise.

Also get at least a couple of quotes (Devis) on headed paper with the company's registration details.

Sorry I don't know of anyone myself. But you have nothing to loose by asking if they have someone in the office that speaks a little English, or do you know someone that could do some basic translating for you nearby or via the phone?

You will find most genuine French companies can find a way of communicating with you if they want your business.  

*Not all British plumbers, builders, electricians, etc are rubbish. But ask anyone who has been here a while and I bet they can all tell you a horror story. Use British by all means, but like Admiral said only use those registered or you could end up regretting it.

Good luck.