Lights illuminate right to left, 3,2,1(although light 1 is fairly dim). All lights remain unchanged from nrmal rnnin when boiler drops out.
Yes good thought, will look at that. The crimps looked OK when switching the board but might be fractured beneath the insulation.
I've just fitted a new Pilot assembly and noticed the injector jet on the new assembly butts against an internal circlip, which had corroded away on the old Pilot and allowed it to move further down the pilot housing. Had noticed the gas pipe to the Pilot was loosening over a few days so this needed replacing anyway, it could be the fault but am doubtful as don't understand why the boiler doesn't attempt relight (no ticking) if the pilot is a problem, just a clunk from the gas valve as it goes off.