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Thanks - I have checked both (in fact I've been watching the pressure gauge for a few weeks). I'll have good look round for signs of leakage but we recently had an extension and much of the pipework is below concrete or below tiled floors. Do you know if it's possible to isolate...

Thanks for your reply. No, the pressure release valve is not leaking at all and gauge does not rise fast.

Pressure is dropping on our combi boiler to below 0.5 and a couple of radiators upstairs fill with air, so we refill boiler and bleed radiators. Same thing happens every few days and I think we've got a leak. Problem is that downstairs radiators are under concrete or under wooden floors...