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According to the installation manual for my newly installed Vaillant ecoTEC 428 plus, the cold fill should be connected from the underside of the flow pipe; mine is connected to the top (as in this diagram). What problems will this cause (if any)? Should I get my plumber to fix it...

I'm in the process of getting the wall replastered and having a new boiler fitted in my cloakroom. I have a quick query about where the 3A double pole switch, programmer and wiring centre are usually fitted. Are there any regulations that cover this, or can I put them where I like (eg...