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Thanks for your replies. The pipework is copper and it looks like its 10 mm in diameter. The plumber said he was 85% sure the blockage was in the heat exchanger and or return pipework. I wanted to sanity check this (heat exchanger idea) as I've read elsewhere that a blockage int the heat...

Hi, no I don't. They're simple locking valves.

Hi I live in a 2bed first floor flat with 8 rads, I have a 5yr old Vailant Combi boiler. The radiators in my kitchen, spare bedroom & storage cupboard are stone cold and recently the radiator in the bathroom cooled and stopped working. I've not had an urgent need to rectify this until...