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thank you so much. sorted. i think it's a pegler bulldog loop in any case - doesn't have black valves - had to use a flat head screwdriver mystery solved. thanks for quick response.

Happy xmas to all Trying to repressurise boiler (it's dropped to below 1, very close to red) but can't see any valves to turn... photo attached boiler is a potterton promax combi HE Plus am very inexpert any advice much appreciated advance happy NY