I need to run 5 Cables (2 x 2.5mm T&E, 2 x 1.5mm 3 Core and E and 1 x 1.5mm T&E) down a wall under plaster where i only have room to chase out a 100mm gap. I'd like to run the cables inside conduit/ under channeling, but i cant seem to find any wider than 38mm. and if i use two of these the cables will be packed in too tightly. Also the layer of plaster is only about 11mm thick and i dont really want to have to make a 10cm wide chase in to my ridiculously hard brickwork. Has anyone got any suggestions of what i can use to cover the cables?