Christmas puzzles – Day 3

It’s Boxing Day, or should that be ChessBoxing Day?

I could have written an article about the new ‘sport’ of chessboxing, but as I really don’t understand its attraction, I shall instead give you a straightforward little puzzle to add to those from the last two days.   It’s another Christmas Tree puzzle, with the White Queen sitting proudly at the top of a rather spindly tree:

It’s White to play and mate in 2.

Don’t put your answer in the comments below, but send all your answers to me tomorrow (after Day 4 puzzle is published) for a chance to win a book prize.