Message over the weekend, old oil Beta not working, no power to it.
Gets there this afternoon, fuse spur OK, power at timer and pump runs.
Boiler as dead as a fart.
Incoming power cable goes through case and round back of boiler, grabs cable and gently pull.
Hey presto end of cable not wired in anywhere. (Bearing in mind I fitted a new motor on the burner two weeks before Christmas and it was all good when I left).
Cable not pulled out as all in good condition and ready to be wired back in.
Nobody had touched it, according to customer.
But it didn't unwire itself.
Strange.