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Ah, boiler bleeding. Didn't know there was such a thing. Is that easy to do or do I need an engineer?

I drained my CH system yesterday and fitted a new radiator and towel warmer, where previously there had been one radiator. I switched the combi-boiler back on using the timer but noticed the pilot had gone out. I relit it okay, but when the boiler fires up fully there is a very loud...