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OK, no pics. Will have another go.

The pressure doesn't seem to change much between cold & hot. There are 3 zones; UFH, Upstairs Rads & Hot Water. No change in pressure when UFH running, or HW but a 0.1Bar rise when upstairs rads switched on. I've added some pics which may be helpful.

Unvented tank

Sorry for lack of response, been working all hours. Jackrae, thanks for that tip about testing. I'll give it a go. Boiler makes a hellish noise when the pressure drops, suspect the water inside is boiling due to reduced pressure.

The boiler is a 36Kw Ideal Mexico, condensing, floor standing boiler. Pressure difference between hot and cold doesn't seem to amount to much. I'll need to monitor it more closely to see. The pressures I'm quoting are showing on the gauge next to the expansion vessel adjacent to the hot water...

Just checked rads. No air or gas in them and ejected water is clean.

I haven't bled the rads no. Hydrogen gas? How is that created?

My unvented cylinder is losing pressure and needs pressurised a couple of times/week. Pressure drops from 1.5bar to almost zero over 3 days. The thing is, I can't find any leaks and there's no evidence of water dripping anywhere in the house. There is a stain on the tank which looks like...