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Perfect reply, thanks. No idea why I posted the wrong diagram, I'd previously found the correct one ! All very clear now. Finally we can have a dammed thermostat instead of just on/off (Which due to laziness ends up meaning the house gets too hot or too cold constantly, wasting energy and...

Hi We currently don't have a thermostat installed with out combi boiler, just the controller switch. This is for heating only. I'm looking to replace that controller with a Nest Thermostat and need to double check wiring. I have attached wiring diagrams for hortsmann, nest & nest wiring for...