I have a radiator in my lounge that is abnormally high (approx 300mm from the floor, compared to 150mm for all other radiators in the house). I presume that it was placed here because there is a single plug socket under the radiator that the original installer wanted to maintain access to. I am now replacing the radiator and would like to take the opportunity to lower the position of the radiator, so as to reduce visual impact in the room. Additionally, my preference would be to convert the socket to a junction box and use this to create an unfused spur to the opposite wall, where I would add a double socket (this would be an additional 3m of 2.5 T+E cable). From what I can tell this is allowed under Part P regulations although I am happy to be corrected... I've read that wire terminations should be easily accessible for maintenance. Does behind a radiator count as this? Are there other options for adding the socket? Also, to make the junction inside the back box, should I use a standard 20A junction box (example https://www.screwfix.com/p/30a-3-te...gclsrc=aw.ds&dclid=CLys7I_P_90CFYYaGwodvuAJPg) - however at 91mm diameter it doesn't look like it would fit inside a single gang back box? Many thanks!