OK, it wasn't really on the Tube, but it's one of Selfridges fantastic window displays on Oxford Street.
However in a few weeks you'll be able to see some real Santas on the Tube, as it's time for the annual Santacon. On December 13th hundreds of Santas or Santae will descend upon London freaking out children everywhere.
I think they've actually been banned from entering the toy shop Hamley's as it's too traumatic for the kids and they tend to be a bit err... over jolly!!
Subway Santas from last year, including a bondaged Tube Santa were blogged here. Look out for more in a few weeks.