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Thanks for that. I have removed the gas-valve. It's a ROBERTSHAW UNITROL 7000 BER-S7AL (PN 446-501-547). The solenoid looks as if it might be renewable. I've put some photos at http://gallery.bigos.org/Glowworm-Boiler-gas-valve Does it look familiar? I would appreciate guidance on...

My central heating uses a wall mounted Glowworm Fuelsaver 30B Mk2. It's given years of sterling service but a fault has appeared. When the boiler thermostat calls for heat, the gas valve solenoid clicks and the main burner lights perfectly with the correct-sized flames. But within 1 second, the...