It turned out to be the air pressure switch. I changed that and it was fixed.
Well, almost fixed! - it then had a problem with one of the relays on the circuit board which would go mental occasionally when trying to light the burners. It would be clicking for up to 2 minutes before it would randomly burst into flames. (the boiler, not the relay!). So I changed the circuit board for the one I had bought (thinking that was the original problem) and hey presto, it's been faultless ever since.
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