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Hi. Just one final question. I’ve just removed a very old unused thermostat controller and I’ve discovered a hole through the wall that leads to the airing cupboard and as a bonus the screw holes for the old thermostat line up exactly with the nest wall bracket. So rather than have the control...

Yes I removed blue, brown and yellow/green. Then cut black and put the cut end in where yellow/green had been.

Thank you so much for your help. I followed your very clear instructions and managed to install it with no problems. I removed the BDR91 thermostat receiver completely by joining the 2 connections in the junction box so I have a nice clean layout.

Thanks for the detailed instruction. After reading a few times it all makes sense. So after my Nest arrived I killed the power and opened up the ST9100C and I have an extra wire going into ST1 (looks like an earth wire to me), so I opened the blue box (sorry I don’t know what it’s called) and...

The third gen. My diy capability extends to replacing light fittings and switches so if it’s any more complicated than swapping a few wires I will get someone in. But I don’t see the point in paying someone if it is as simple as changing a light fitting.

ST9100A We have a wired in timer and a wireless temperature control

I currently have a Honeywell wireless thermostat and wired in timer. I want to change to a Nest thermostat. I’ve provided a photo. My question is, when I remove the cover from the blue box do I simply disconnect the timer and wireless receiver wires and then wire in the nest receiver or is it...