Small update - I located one of the shraeder valves on the piepwork to the air con & pushed it in with a key to see how much gas I had - hardly anything!
So getting the system re-gassed tomorrow before I do anything too drastic.
I hope I haven't mashed the clutch using it with hardly any gas....?
I located the compressor but could not quite see the label to identify which unit I have, will keep u posted ;-)
cheers all
Martin