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Thanks to the person who wrote that section (and the plumbing for dummies one!). I've got a much better picture of what is going wrong now, and also understand my heating system a lot more. I've narrowed it down to a few things that could be a problem, with a list of things to check. still...

Hello, I'm a complete novice to boilers etc so need a bit of advice please. I've read a post below that sounds exactly the same as my problem, with a loud 'knocking' noise and then boiler shutting down. A user comment was: "No air in the expansion vessel, no room for hot water to expand...