Christmas was fast approaching and Santa was in a world of hurt. Toy production was behind schedule, and the Elf union was threatening a strike. Mrs. Santa had washed his Santa suit with the lists of which children had been naughty and which had been nice in the pocket. Two of the reindeer were down with hoof and mouth, and he had just taken an "extended warranty" call about his sleigh. To crown it all, City had just been smashed by Aston Villa.
There was a knock on the door. Santa grumbled "Now what?" and answered the door.
There was an angel holding a beautiful tree. "Hello, Santa. I'm the Christmas Tree Angel and I have brought you this lovely tree. Where would you like me to put it?"
And that is why we traditionally have an angel on top of our Christmas trees.