Hi, its me again. Scenario. Single skin exterior wall being studded out and insulated to change the room into an extension to the kitchen. 50mm airgap between single skin wall and 100mm studding. I want to run electrics down to new sockets to be installed in the wall, an afterthought now the stud work is up. My initial idea was to use 2 x 50mm celotex in the studding and channel down the middle, but reading the Celotex website this is a no-no. So is it ok to run / clip the cable down the inside of the single skin wall inside the airgap? Then through the Celtex at socket level filling round the wire / celotex with foam? Drip loop in the wire just to be safe in case of condensation?