The only air vent i can see is the one near the HW Cylinder. I've just tried that and no air came out. I have a feeling its not air though as when the boiler is turned off you hear it bubble up the pipe. Thanks for your help.
I'll leave it a while and see what happens then. Its due a service too next month so maybe I'll ask them. Anyone know a good boiler servicing engineer near Basildon in Essex?![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I'll leave it a while and see what happens then. Its due a service too next month so maybe I'll ask them. Anyone know a good boiler servicing engineer near Basildon in Essex?