I've replaced the pressure relief valve, emptied the expansion vessel, pressurised the expansion vessel and fitted everything back together. Re-pressurised the central heating and ran it for just over half an hour, it has now been off for well over an hour and it seems pressure is "holding". I have a slight weep on the water inlet so will disconnect that and try again but it is very very slight.
Never knew the expansion vessel should have been pressurised. Was then unclear about central heating pressure and expansion vessel pressure but that's now sorted.
Even a new expansion vessel is only about £30 so if that has also failed it is a cheap and easy change.
If this is solved then under £20 which is surprising as the web site showed the pressure release valve as nearly £50.
I'm well chuffed, the thought of carpets and floors up was stressful
macafee2
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