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We had this old British Gas central heating thermostat which has the following wiring: I thought it was going to be straight forward to wire it but doesn’t seem like it. Looking at the wiring diagram for the dual channel I am missing a cable Any suggestion?

We seem to be the owners of a boiler with a life of its own. We bought our property that came with this boiler, commissioned in 2015. The previous owner had a complete file with the history of this boiler. British Gas installed it then came out for repairs several times over the years, almost...