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Just to let people know the outcome for future reference - my issue was that the flexible hose that connected the expansion vessel to the rest of the boiler became blocked. Therefore, no matter what the pressure was in the EV, the pressure on the other side of the bockage kept building until...

Steve I will put a bag over the outlet tomorrow and see whether there is any leakage. The pressure does not appear to go too high when the boiler is on - it only seems to go up to 1.4 bar or so. I guess the bag would tell me whether it is a faulty PRV? Thanks for your help MM

Steve I did as you suggested and checked whether there was water in the diaphragm but only have air escaping, no water. I am assuming that this must mean that the EV is ok? I pumped a bit of air in, to replace what I had let out. Any other ideas? Thanks MM

Thanks Steve - I appreciate your response. I will check and post whether there was water coming out, as the engineer emptied the EV ("these things can happen over time...."), reinflated the diaphragm and assured me that this meant the EV couldn't be the problem.... MM

All I have a Glowworm 30si that is about 4 1/2 years old. We are currently experiencing pressure loss overnight, with the boiler pressure at 0.6 bar in the mornings. I have had an engineer come and look at it about four times, and it would appear that they are completely lost. These are...