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Hello ollski, Many thanks for your prompt response. The valves stick out horizontally from the radiators. At the end is a circular black piece which sticks out about half a centimetre and it says on it 'Danfoss Thermostat'. The main part which twizzles round and which has on it the...

I suspect that some of my TRVs (which are quite old) are stuck. I have read about removing the head and tapping the body but unfortunately I cannot remove the head. I can pull it about half a centimetre and then I have to let go. It feels as though it is on a very strong spring. There are no...