Air lock in Bosch Worcester Combi Boiler?

most decent plumbers/boiler won't charge that ...

also if its to do with gas, they have to be corgi registered.

check that before letting them near it..

if its a matter of "bleeding" it like you would a radiator, i can't see how they justify so much..

try to find a person local who comes recommended+corgi reg'd and not one that was mentioned on rogue traders ;-)

Don't think it will be an air lock. That would flush out of the boiler when in use. Is the pressure up to 1 bar? If not re charge the system pressure. Is the heating side working? Call out a local engineer, might be cheaper, but ask the fees first.

depending on what model worcester boiler they have, there a different ways of venting,

try resetting the boiler, if you dont know how to, just turn off the power supply to it, then turn it on again. this may help push the air out.