Sorry Brian was at work this evening. back home now and it's like a commercial freezer in here ! I've had a look around the airing cupboard and there is no fill loop. I am unsure why as I know this is how most would re-pressurise the system. The two black handled valves leading to the pressure vessel is the only thing I have that sounds remotely like it, although it is a fixed pipe, not flexible, nor braided. Guess I will try again tmw to see what's going on. Going to get an extra duvet. :) Thanks for your help!
N.P
January 2011