Thanks for reply.
I'll get a cap on the way home. I presume they'll be available at most DIY stores (Homebase, Wickes, etc).
Are they called Radiator Valve Caps, or something different. What size am I looking for? Or are they a standard size?
I've just been told I need to remove a radiator so the plasterer can plaster behind. It's a Combi Boiler system and the radiator has a thermostatic valve. I've read the postings stating that this could open up again if the room gets too cold.
However, the boiler (Glowworm) is swithed to...