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    Boulter Camray 5 Oil Combi - Nest Wiring Query

    Hello! I'm looking for some assistance with installing a Nest Heat Link and Thermostat to my old Boulter Camray 5 combi boiler. I have a programmer fitted to the boiler which is original as far as I can tell, with the programmer and wiring diagram shown in the images below. I'm confused as...