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I've realised that the vent fitted to the 22mm feed pipe from the boiler is on the coil side of the motorised valve controlling heated water going to the HW tank coil. This of course means its only effective when the HW is 'on'. I might have tried it many times when the HW was 'off'... duh.

I appreciate that lots of people ask this question but I'm having difficulty finding an answer to my exact problem. We had a new heating system installed when we rebuilt our cottage. Oil fired condensing boiler on the ground floor with all plumbing at first floor level. The system has never...