I am trying to move a socket in my daughters room that was on an internal wall before previous occupiers built a wardrobe in the alcove. The ideal place is a couple of feet along the wall but on an external wall. I have two main questions: is it wise to move the socket to the external wall? My house was built in 1930 so I've taken the plaster coat off to the bare brick but have a feeling this may be the external wall and don't want to start bolstering the brick and damage the outside wall- the problem here is that I would need a 16mm double socket box and I don't think they exist?
Question 2 is that I have inherited some cable on a reel from an office refurb. Its a flat grey sheath but appears to have 4 wires inside coloured black, brown, grey and bare- I can't figure out what sort of wire it is and if its suitable to use with a junction box to extend the socket wiring to another part of the wall. Would appreciate any advice/clarificationb!!