GFCH 1 year old and the pressure has dropped, and I have bled all rad's and some air was relished but still no change .Main problem upstairs Bathroom, Bed 2 and bed 1.

Previously, the fitter came round and with a small silver tube restored the pressure, but because I am out of warranty and he spent 15 min's a:eek: ny suggestions...?

Yes you will need to increase the pressure in your system. I guess you do not have a auto fill?