Thanks for all of your tips.
I spent a fun day yesterday off work and isolating the pump, 3 port valve and got nowhere.
Mrs Z got fed up and called a plumber from a local firm. According to the website we got the foreman.
He could not figure out what was wrong for a short while as the circuits were testing fine.
Then he found the problem. A power cable to the boiler was routed around a hot part and melted exposing the core which shorted.
8 inches of cable removed, replaced and rerouted and a £111 bill for an hour and a half’s work.
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Central Heating Timer Blowing Fuse new
Central Heating Timer Blowing Fuse new