I have a a 4-way light switch in one room which I would like to move to the hall. I can't easily access rose connections as they are all over the place so fully replacing switch cables is not an easy option.
I've considered extending the existing cables back up the wall using 1.5mm, running across the top in the safe zone and into the hall, then back down. I was then going to move the existing light switch out into the hall, and splice the cables in the old switch backplate using connection blocks. I'd then cover the old back plate with a blank panel.
Is this a reasonable, compliant, and safe approach? My concerns were with (1) this approach to splicing and (2) with running six cables next to each other back up the wall due to any derating, heat, etc concerns. (I cannot figure out the IEE site guide with regards to this)