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I think its time to send for my friendly electrician but many thanks for your guidance. Perhaps I should come back to you when the problem is solved.

The pump stops when the CH stops working. The radiators do get hot when the CH is behaving itself

Thanks Jackthom. I have programmed the HW to start 5 minutes before the heating; sometimes the heating will then continue after the HW tank is satisfied. Today it shut off a few minutes later and then seems to come on for a few minutes every hour or so. Yesterday it worked OK.

I have DHWC system with separate 2 port motorised valves for HW and Heating. The HW circuit works satisfactorily but, from time to time, the heating circuit will only work for a few minutes at a time and then shuts off. Is this a duff motorised valve?