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Or could I power the nest thermostat using a 12v transformer powered from the junction box area and connect the old thermostat cable? As I have a socket in there for a back up heating element that is never plugged in

Ok cool got all of that. Just 1 thing to clarify. When u say extend the old thermostat cable to be used as the 12v. Do u mean run a new cable from the junction box area(but connected outside) to the the heat link. Only ask this would be a pain as junction box it upstairs and the heat link is...

Hi stem I am going to go for option 1 as I want it to be done correctly I have found the thermostat cable that goes to the junction box in airing cupboard. Linking the red and yellow together is all fine. But what I want todo it use the 12v power from the the heat link. Is it possible to do...

Thanks for your very detailed reply. But I already have the nest. I just wanted help on wiring it up. Have attached pictures to show people what I have. Just wanted a hand with th wiring

hi guys. Read a lot of other posts and can see some really good help. I have a Honeywell programmer and room stat in hall. I want to change them over for the nest gen 3. Want to make sure I get it right and want some help on how todo it. Here are some pics of my wiring and system to help u guys...