I don't understand why the ileo would be higher up. Is he talking about a temporary ileo if he leaves your j-pouch in? I was diverted to a permanent ileostomy first. When my j-pouch didn't heal up I had it removed 6 months later The permanent ileostomy stayed in the same location. This is much better than the temporary ileo I had in-between my j-pouch surgeries. It was higher.
Maybe in the U.K. being diverted to a permanent ileo isn't an option.