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Thank you very much buck51. It turns out you were right and I eventually traced the fault due to an open valve pressurising the balanced circuit (strange plumbing!) and back pressure through thermostatic mixer. All sorted now. Giles

Thanks. I do have thermostatic mixer valves but they connected to the balanced cold which is supplied by the same pressure reducing valve. It is a thought through and I will explore what other systems are supplied from the unbalanced mains. Thanks again and any other ideas.

Am having an problem with my sealed HW system pressure. Recently I noticed water dripping through the tundish from the relief valve on the cyclinder. What seems to be happening is that the pressure in the HW cylinder rises to 6-7 bar and the pressure relief valve (7 bar) starts to drip/vent...