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By the way - I opened the box and sprayed some rust loosening, thin oil in the middle. The hot water valve immediately moved very easily. The stuck heating one improved but does need replacement, however it also currently works. I feel it will last until the plumber has time.

I found 3 motorised valves: one for hot water, one for upstairs and one for downstairs heating. Actually two (cringe smile) do not seem to work correctly, the hot water and downstairs heating one. They are Honeywell F 3 - 9647 valves. So your likely diagnosis was not only prompt but also...

Hallo, I have above boiler since around 3 1/2 years with two Honeywell CM707 thermostats, one for upstairs and one for downstairs. Worked brilliantly for 2 years and still does the job in summer for hot water, but now as soon as heating season comes, boiler often stays on and fires no end...