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Thanks for the help. I have an isolation valve that supplys the house with hot water inline after the hot water cylinder, when this is closed off the dripping in the header tank from the vent pipe stops dripping, proving your diagnosis's correct. Just have to figure out which of the for mixers...

Hello, SYSTEM I have a conventional worcestor boiler, a 50 gallon water tank, a hot water cylinder APX 7 years old 1100mm x 450mm apx and an expansion vessle fitted. PROBLEM The overflow pipe runs outside the house from the cold water tank, when the hot water hasn't been used for apx...