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Fluffster, Thanks for the reply. I have drained the system a second time with the pump isolated such that the head of water in the expansion tank drained through the boiler - I also set the three way valve to 'flushing' as ths may have been the cause of an airlock on refilling (with the pump...

Wondered if someone can help! I have a central heating system with a header tank which I recently drained, applied cleanser and refilled. The radiators have been bled and the system works fine - problem - boiler is knocking, banging spitting! I have re-bled the radiators but no further air is...