I haven't got around to setting up a television yet, so I didn't discover this song until I was browsing Youtube on Christmas Eve.
I don't care whether it's real or contrived. I WANT it to be real.
This is an attitude to music that I share (along with much of England I suspect). I enjoy provoking my wife by making up alternative lyrics to well-known songs.
That this made it to be a Christmas Number One (still a big deal in the UK) helped put me in the right mood for Christmas.
Anyway, click on the picture below to watch the video. Feel free to sing along. I enjoyed that bit even when my wife groaned at me.