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Thank you so much! This is so helpful. I just repressurised again and two radiator valves were in fact leaking. I will tighten them and see if that will work. If not I will follow up on the filter, and ask downstairs neighbours to look out for leaks on the ceiling.
Really appreciate the help!
plantasia-
We had a couple of pressure drops recently, and the plumbers advice was, you can have small leaks when the system is warm and at a higher pressure which will go unnoticed because they just evaporate when the pipes are warm. We have multiple radiators off the walls at the moment which means there is ample opportunity for small leaks.
As a side note, sorry if this is pointing out the obvious, make sure you repressurise when the system is cold.
rj
Possibly the water intake filter needs cleaning, and if it's not clean then the boiler path for water to be heated will be getting clogged up. Depending on where this may be happening in the system it can result in either low or high pressure... the pressure monitor is one place, so is the clog before/after the monitor.
Shouldn't be too expensive to fix, at worse may involve replacing some other filters and brass fittings as those will have been eroded a little. But this is an eminently fixable issue.
I used this guy for a similar job https://rokas.london/ he was freaking excellent. I couldn't give a line-item cost for this part of the job as I was having a Nest thermostat installed at the time, and the annual inspection, so he did a deal for all of the labour as a single thing and my invoice will be meaningless for you.
What I will say is that he is conscientious, not a crook, definitely knows his business and did an absolutely stellar job.