I'm after some outdoor trunking, you know, the brown half tube type that is commonly used by cable TV installers. I have several cables including TV/CCTV cables to be fastened to a wall, but rather than individually pin them all up, I thought it'd be better, and less damaging to the brickwork, to have a strip of this trunking that they can all go in, and it makes it easier when new cables are added, and to change cables, etc. I can't seem to find it for sale anywhere though?