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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.