True. It's in the Highway Code. Then again, so is 'move quickly past the vehicle you are overtaking, once you have started to overtake. Allow plenty of room.

True. It's in the Highway Code. Then again, so is 'move quickly past the vehicle you are overtaking, once you have started to overtake. Allow plenty of room. Move back to the left as soon as you can but do not cut in'. But you wouldn't know it driving on UK motorways.