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Hi mate, Try this thread... The wiring looks similar to yours. https://www.diynot.com/diy/threads/smart-thermostat.533795/

Brilliant, thank you. I'll give it a crack when I get home. Yeah I'm not sure why that was left hanging. I told the 'Mrs' to not go anywhere near it once she had sent the pictures.

Hello, I'm trying to work my head around wiring new smart thermostat in, I'm tired of the house being stuck at 27 degrees, and so is the heating bill. Port 1 and 2 on the new thermostat "Dry" and "Contact", which I assume correlate to with the black and grey wires from the boiler? Whereas 3...