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Thanks for the info. (By the way, I'm not the builder who cut through the pipe, just the householder.) I will vent radiators but don't think there is any way for me to vent high points in pipework?? Also, how do I know when the heating isolating valves are in the open position? P.S. The hot...

Builder accidently cut through rad. pipe, draining water from heating system. Pipework now repaired and boiler filled, but when I turn heating on, boiler fires up for 8 seconds and then switches off. Could it be an air lock? If so, how do I clear it. I have discovered a key underneath boiler...