I would hate to learn that the evap canister was being taken off just to make the engine bay look pretty. That part is an important environmental protection device. Without it one would be allowing much more pollution into the environment.
Also by leaving it on the car does not take away from performance once the engine is warm.
Regarding MOT, I would think you need it. As far as relocating it, I don't see any issue with that regarding passing MOT, but check your local regulations before attempting it. [it is already in a fine spot imho]