Kristen Stewart as Princess Diana has now been banned from hiring a British actor in the key role of a young Prince William because of Brexit, according to a casting notice.Casting director Amy Hubbard tweeted an appeal for a young actor to “believably play Prince William at 11 years old” for “Spencer,” an upcoming docudrama about the late Lady Di.“Must have a European passport (NOT British European due to new Brexit rules from January 1st 2021),” the appeal noted of the film being shot in