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Brilliant - thanks for your help.

Thanks - so looks like I should have got the TP-One-B, which looks like it would work with the wires I've got coming from the boiler? Presumably brown --> COM, blue --> NO and green/yellow --> NC

Sure... Old thermostat looks like this: And wiring diagram on the case:

I want to replace an old rotary thermostat with a programmable Danfoss unit. I figured (maybe wrongly) a thermostat for old boilers is going to be little more than a glorified switch, so the wiring would be easy. But having pulled off the old one, I'm confused. The old one has 3 wires: brown...