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There are various mains powered gubbinses in your boiler - the central heating pump, the flame igniter, the diverter valve, plus the circuit board itself. One of them is causing an overload when it's switched on. The challenge is to figure out which by eliminating components that aren't failing. I concur with suggestions the water pump is the most likely option.
(It's also possible the faulty component is drawing just slightly too many amps which would pop the fuse slowly. A plug in power meter would be useful for diagnosing if this is happening)
grams
Ok. So boiler is dead again, no power. It stopped working again this afternoon after being fine for a week, I stuck a new fuse in the plug, it fired up again, then less than 5 minutes later there was a sharp pop and it died again. What’s blowing the plug fuse? It’s not even tripping the fuse box.