Checked the cupboard last night and it's only a small gap to fill - about 3"x6"x3" so it wouldn't be as though I'm surrounding all the wires and circuit board which my original post implied.
Thanks
From the exteranl electric meter cupboard/incoming supply the wires run inside a stud wall to an internal RCD board in a small cupboard in my hallway. This is very drafty. I cannot insulate/plug any gaps behind the meter, so wondered if it is safe to carefully insulate around the RCD - obviously tak...
