For crying out loud, I agree. They can always haul Mama D. over to London along with the nurse/nanny since the media is always playing up how enormously wealthy they are.
I wonder who's private jet they're going to cadge for the trip. Of course, they better hurry up and make a decision, they have to give the Home Office at least 28 days notice.
Maybe they're in a bind. Harry might have been informed if he leaves the US, he may not be allowed back in the US upon return from the UK.