Any question answered...

Who knows about boilers? Ours has cut out. No lights. The last couple of days it has been acting a bit funny (not getting hot water to the taps if the radiators had been going). The internet mentions if may need to be re-pressurized (?). Is this something a normal can do?

Google the manufacturer/model etc. Manual should tell you how to re-pressureise. If set up right it's a piece of piss, so easy even I can successfully do it.

Don't over-pressurise though.