How do you find someone who knows about under floor heating? It's such a new technology...we've got a pressure valve that keeps dropping to nought and we have to release it so it goes back up but every time it does, the heating doesn't work as efficiently. Nobody seems to know what to do about it. The people who provided it send us back to the plumber who sends us back to the people who provided it. Come on guys, get your act sorted!
PS. It's still warmer than my sister's Victorian house though!