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Fixed it! may have originally been two separate problems, one masking another. I replaced the venturi in the fan casing, the old red one now superceded by a grey one of a slightly different design, and lo and behold, it worked! Cost of bit £2.51 plus VAT.

I'd love to know if you ever found the solution to this, I have the same problem with the same boiler. I have been trying a variety of approaches and so far have replaced the main PCB (twice), gas valve PCB, temperature sensor (thermister), and overheat switch. I've had 3 different engineers...