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The wire into 5 comes via the remote thermostat. Not how I would have wired it but it works.

Thanks. That makes more sense now. So the way I see it the yellow and wire joined in the terminal block (to a black wire) should go to position 6 but is taken off to a feed from the remote thermostat.

Hi I am attempting to replace a Horstmann Channel XL plus with a Nest thermostat. I have not been able to find a wiring diagram for this particular Horstmann model. I can find the diagram for the series 2 but that appears to be different. I was expecting to see a wires as below: Earth (empty)...