There is some diplomatic anger going on now, about the Spanish government being in limbo.
La reina Sofía llenará el vacío que los reyes han dejado en Londres
Queen Elizabeth II has understood the reasons that led to the Spanish caretaker government cancelling the trip. Not so the legions of senior officials of the Foreign Office, Buckingham Palace and even the Shakespeare Company who had completed all the details of the historic visit, 30 years after the last one. Madrid are blaming now London because they insisted to issue the joint statement with the December 3 elections inbetween.
London responds by saying that since Madrid had stressed that "the government may be in office, but not the state." Rajoy began to doubt the advisability of the trip in early January, but only communicated to London after a month with invitations for the gala banquet sent out and program finished.