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Sorry chaps, can I just ask one more very quick question: If I take the feed from my socket into the FCU, does it matter what size cable I use to do this - as in do I have to use 2.5mm cable from socket to FCU?

Awesome, thanks for your help; I'll get everything I need and make a start on it this weekend. Just one more question, which might not even matter, but i'll ask anyway just in case: Should the FCU be placed close to the NEST, or can it be placed it nearer to the socket?

This is the only 2-core flex that Screwfix has and it's not that expensive either for a 10m coil... https://www.screwfix.com/p/time-3182y-white-2-core-1-5mm-flexible-cable-10m-coil/905jy

Thinking about it, instead of cutting where I originally intended to cut, can I take a feed from Socket 1 directly into a new FCU? If I'm not mistaken, this would be classed a spur off of Socket 1 - correct?

I've taken a pic (please excuse the mess) and added some crude arrows and text boxes to explain where the two sockets are and where I intend to make the cut for the new junction.

The socket on the wall is approximately 1.5 meters from the centre of the ceiling where is the NEST is to be placed.

Fab, thanks for the advice. I'll have a look for a 2-core flex on Screwfix/Toolstation

So my plan of action is this: Between two of the sockets, I'll safely cut into the 2.5mm² cable. I'll attach both legs of the cable into Wago 3-terminal blocks and add a 3rd cable for the new FCU. I'll take the load for the NEST using 1mm² cable from the FCU, and hopefully that'll be that...

Ah, yes! You presume correctly - CO... Sorry... Boiler is in the kitchen, not in the garage. The reason I went for another NEST is that I already have two installed in the house. And the reason why I need to install a smoke alarm in the garage is because I will have a stack IT servers running...

Hello chaps, We've finally moved into our new house last week, and I need a bit of advice please on the installation of a NEST Protect smoke/CO2 alarm in my garage. I have 2 incoming power circuits into my rather long garage: 1. One for lights at the front of the garage, taken from the 1st...