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Thanks guys. Problem solved. The wiring in my junction box doesn't seem to follow any conventions, so I traced things with a multi-meter and now it's working. The cowboys who installed the CH should be shot...

Thanks. It's definitely the valve itself. The head's been replaced three times! The only way I can get the boiler to stop coming on in the middle of the night is to remove the head and force up the valve then replace the head which tells the boiler to go to sleep... The valve spring isn't strong...

I'd like to replace the sticking valve - Honeywell VC4613 - with a better V4043H valve, but the wiring colours are slightly different. Can somebody tell me the corresponding wire colours for each valve please? I'm having trouble finding a full wiring diagram for the VC4613. The V4043H...