I found out what's wrong with the boiler!!!!!!!
There's a battery at the back. When the boiler wouldn't fire up on holiday I
took out the battery noticing that it was probably over 10 year old (
Sainsbury haven't used that design for years). But a certain male not too
far from here said " Oh no, that only works the ignition"
Of course when I thought about it I realised that the boiler at home wont
fire up unless the leccy is on. So I ignored him and put a new battery in.
Guess what - its working fine!!!!!!!!!!