Just one more thought - if it is an intermittent fault, not just bad contact, we don't know 1000% that it's the gas valve. Gas valve is most likely culprit, but it could be the control-stat, or maybe something else.Fair one mate, I'm gonna knock it back to landlord and state it's working now but if it goes again, part Center quoted 3days on delivery, so probably be best if landlord orders part and stores it