I'm currently extending a previous extension. As part of that i'm cutting a channel into my extension floor for a soil pipe to go in for an ensuite we're pre planning for. It seems daft to have to cut a second channel for the electrical supplies that'll be needed on the Kitchen island the pipe runs under so is it okay to put a suitable conduit that close to a soil/waste pipe and also a possible hot/cold water line(GF not decided on sink location yet!) all within the confines of a single pea shingle lined Channel/trench?