Just a heads up. For those like myself who do not live in the UK, the torrent is live. I don't think Charlie Brooker would mind you getting it that way.
EDIT: Just watched it. Charlie Brooker you are one cynical bastard and I love you for it. This is definitely one or the bleakest holiday specials you will ever see. It is brilliant but it will make you want to break out the holiday spirits early, fill the bathtub with them, and drown yourself.