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The boiler is a combi boiler, brand Alpha model CD25X.

Hi, i'm new here so please be gentle. I want to replace my old Satchwell TLX2259 thermostat with a new smart one either Nest or Tado. I'm not a sparky by no means but i do dabble a bit with changing a socket or replacing a light fixture etc.. i've watched some video tutorials online about how...