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Looking at the illustration in the FAQs, it was the filling loop I was tightening up, not cold water pressure valve. I could not locate any stopcock that would stop the pressure rising, with corresponding leakage from the overflow pipe, so had to close the water supply. Could anybody help...

COMBIcompact Vaillant boiler VCW-GB 242EH or 248EH problem: The pressure meter is on 3 (should be on 1 when cold) and the overflow pipe drips profusely, presumed because cold water keeps coming in, so I tightened up the cold water pressure valve (?) as much as possible and the white plastic...