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Thanks Doc, hopefully the wiring diagram in the following link helps understand the installation (https://ibb.co/FsHCGSG). I'm confused as I assumed that the cable indicated in the diagram (3 core flex with Red, Blue & Yellow - labelled "Cable going to boiler??") would go off to the boiler...

I'm installing a Hive Active Heating Thermostat at my parents, however I'm confused with the current installation of the old wired programmer and thermostat. They have a Vaillant ecoTEC plus 418 conventional boiler installed in the garage with a programmer in the kitchen and thermostat in the...