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Many thanks for your help. Still having peculiar problems. The pump must be working OK because all radiators get too hot. The pump shaft is free (removed vent plug and checked), and it responds to each of the three speed settings. If the thermostat is turned down when radiators are far too hot...

Boiler was very noisy so I flushed it out, removed a radiator that was not getting hot and flushed out lots of murky sludge fom it. Boiler now runs sweetly with very little noise but the overheating and extinguishing persists. The themostats were all replaced as a matter of general maintenance...

Pump is certainly working OK. All radiators get very hot and pump still runs when boiler has gone out.

Apollo 65/80B wall mounted gas boiler very gets hot indeed and goes out. This happens on high or low settings and the pilot light then has to be re-lit to start the boiler up again. All thermostats have been replaced. Could this be a gas valve problem ?

Apollo 65/80B wall mounted gas boiler. A problem that is now getting worse is the pilot light extinguishing after banging noises from the boiler. this happens on Hi or Low settings. Could this be due to overheating and requiring replacement of Hi and Low thermostats ?