Thank you ianmcd will give it a go. But how could you tell what was what wire I forgot to upload a picture of the diagram on the inside of the old thermostat case.
Hi I'm struggling to identify what wires are the common and the normally open wire on my drayton rts 9 thermostat so I can install the nest thermostat e with heat link. I have attached a photo of my thermostat and the wires.