UK answers in particular please ...
The underside of the staircase and main escape route in my new house is in my kitchen, and has my fridge immediately underneath. Is there an easy way to check whether the board on the underside of the stairs is fire-rated? Will the pink fireboard paper be revealed if I carefully scrape off some paint, or will the pink colour come off with the paint? And has it always been pink?
An added complication is that the house was built in 1960, so if the stairs are original, then this board may be asbestos, not plasterboard. Asbestos provides very good fire protection, but must not be cut or drilled into. For which reason, simply attaching an extra layer of fireboard onto the existing board may not be wise. (I'm assuming board attached with dabs of plaster isn't much use in a fire).
Background: I have recently learned that fridges are no longer the incredibly safe appliances they once were, but are now packed with flammable insulation and are using flammable hydrocarbons -- basically lighter fuel! -- as refrigerant. I'd move the fridge if there was anywhere else to put it, but there isn't. And yes, I do have plenty of fire alarms.