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Thanks for input and suggestions, I have to go back in the next week or so and will try and get one of the valve apart then. I should have posted the following picture as well. The confusion was the turn of 90 degrees to throw the pointer right across the scale suggests TRV, however...

Came across the radiator valves shown recently, double entry valve piped on 15mm copper. If the head is turned the indicator moves across the scale 1-5 but there does not appear to be any change to water flow, ie hot water flows through radiator whatever the setting. It needs about a 90...

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