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Thank you all, this is brilliant. Confident to go ahead soon. Will try and post what i did for others to use (if it works).

OK, on further inspection of other posts I realise i got something wrong. After checking grey cable 1 and 3 have their orange wires meet at contact 3, with cable 2 to 4. I now think: 1 - earth 2 - live 3 - room therm/HW 4 - HW on 5 - Heating on 6 - 7 - HW off with cable 1 the room thermostat...

Thanks Novice - it is the heating system fitted by the housebuilder. Valve is a Drayton MA1. I was hoping to work out which cables are to the programmer and pull them out before connecting to the Heat Link.

I am looking to add a Nest to my heating system which I believe to be a y-plan. Having read https://www.diynot.com/diy/threads/lp522-nest-upgrade-almost-working.535014/#post-4570472 (and briefly hi-jacked it) I'd like to keep the thermostat in the same place (living room) and make use of the...

Thank you Stem and apologies.

This is really helpful, thanks. I am planning to do the same switch on mine (not removed anything yet) but had a quick question about the existing thermostat. I assume it is mains wired from the junction box in the hot water tank cupboard. If I wanted to use the same location for the Nest...