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I am having to post a reply to my own question If only to help others out there with similar problems. From day one I said to my Gas Engineer I am sure the valves is broken itself and was told I did not know what I was talking about and that knowledge is a dangerous thing. It works out...

Having probs with 3 port valve, was ceased freed it up, actuator now replaced (assumed synchromous motor burnt out) know that actuator moves OK when not connected, sure valve is OK still moves freely but rads will not come on fully downstairs not convinced I have fitted actuator...