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Just had an engineer visit and it was the expansion vessel causing the problem which is exactly what you alluded to. Thanks.

Thanks for this. I am a novice (could use the word thick) to all this so does your answer mean that the issue you raise about expansion vessels and PRV's can be the reason for the pressure drop and can be fixed i.e. if that is the problem is that classed as a 'leak' and therefore does not mean...

I have a Ravenheat Combi boiler and have been losing pressure - currently drops to bout 0.5. Strangely at this level I can still get hot water and when turn central heating on it goes up to 3 bar and gradually comes down when heating is goes off. I can repressure it but drops down again over...