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Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws

Just get someone out who is experienced and prepared to service and fault find on your oil boiler.
If nothing noticeable - including any weeps near electrics or pump or burner, then anything that has an electric motor could be faulty.
Nothing to do with your oil pump
 
Well, I'm up and running again - but won't know if it's properly fixed for 24 hours. Very impressed with my superhero, Dion, from Qualitas Heating of Henley - so far at least. It seems that the problem was caused by a failing synchronous motor.

Thanks for all help and advice.
 

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