Hi again all.
I want to put a letter box into a cavity wall. The wall is double concrete block and, in total, is approx 300mm thick.
Does anyone know where I could get a letterbox which will go through it - and eliminate (as much as poss) draughts! (I know I could mess around with some galvanised sheeting to make a slot-shaped box and then buy a standard letterbox front to go on the outside wall, - but I'm trying to save time!)
TIA.
H.