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Argh. I was going to do that when the heating sprung back in to life a day or two ago so it dropped off my radar. Just bypassed the thermostat and the relay still chatters; at least that rules out one part. Figure the next step is to find a replacement relay and see if that cures things.

It appears my heating system is throwing a wobbly; I have a system boiler set-up (Ideal Standard I think, can check), hot water works fine but the heating is problematic. When I adjusting the thermostat (Drayton RTS8, running on 24vdc) to kick the heating in to life results in relay chatter ...