Hi just found this forum and its seems very helpful. I have a two bedroom apartment and a glowworm 30 ci keeping us snug. The problem is that over the last 8 months the pressure has been dropping from 1 bar slowly to 0.4. I keep trying to repressure it using the blue "pipe" tap but it seems to only have a very small effect. I am by no means boiler literate but the pressure relief valve (if thats what its called) seems to drip when i try to repressure the system using the blue tap and occasionally i get get it to go up by 0.1bar and keep in functional. Logic to me seems to indicate possible a faultly pressure value as i even though the pressure is well under 1 it keeps dripping when i try to refill. Is that a likely cause or have i missed something else i should be checking. Just to clarify the pressure is the pressure of the water in the Central heating system that is being reported correct? I havent bleed the radiators in a long while would this help?