Your boiler only has one pump
It is not the diverter valve
Yep probably correct, your boiler has a thing called an air flow switch, this is basically a small aluminium flap the moves when the fan runs and if they get a build up of crap the boiler behaves like this
indeed depending on the serial number there were different switches used, if I remember correctly there was one APS that was adjustable, had a small dial on it been a long time since I seen one though
if you say where you are in the UK someone might be able to recommend someone for you, it wont be the fan, it might need cleaning, but as already said differnt models used different air movement sensors, not a huge deal to fix to be honest
London is a big place try and local it down a bit , lots on here cover London, thank god I dont , I couldnt think of anything worseI am in London
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