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Thanks for interest. The very able (Gas board trained) Corgi engineer initially thought it might be the air pressure switch and cleaned the 'nozzles', then waited and the fault occured (stuttering main gas valve) diagnosed faulty main gas vavle solenoid and replaced it. He said wait for a week...

Good advice! But what about the problem? Intermittent start up - gas goes off - fan stays on- boiler goes cold. Switch off power - boiler sometimes fires up immediately - sometimes the pilot lights - the main burner stutters with accompanying metallic 'rattles' and then fails to stay on. All...

The boiler flame cuts out - probably due to water temp as usual - fan stays on,then will not come on again and goes cold, but the water pump and water solenoid vaves remain open (ie power is there). When the programmer is advanced to off and then turned on again the boiler fires up. The period...