Apologies
The plumber eventually turned up. No permanent pilot light on this boiler type and no thermo couple he said. Who was I to argue. It wouldn’t ignite, so on the programmer he advanced both the CH and HW settings by one hour and hey presto. It’s worked ever since, igniting for both CH and HW on two daily on/off periods, plus permanently on programme.
I’m not sure he knew what caused the inability to ignite. I certainly didn’t.
More recent pressing things have been raging toothache and rear molar extractions today so not firing on all cylinders recently ! Dentists terrify me.
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