Winnie the Pooh was a fictional bear, and the main character of the series of books of the same name.
Susan Foreman cited him as "living under the name of Sanders", much like how she lived under the name of Foreman. (PROSE: Time and Relative [+]Loading...["Time and Relative (novel)"])
When Clare Keightley first encountered the Fourth Doctor, she felt a wave of familiarity and trust, "[as though] he was as familiar as Father Christmas or Winnie the Pooh", mainstays from her childhood. (PROSE: Shada)
Ace wore a Winnie the Pooh pin on her black bomber jacket. (TV: Dimensions in Time)
Rose Tyler tried to make a toga out of a bedsheet in preparation for her visit to 2nd century Rome. The Tenth Doctor pointed out that Roman girls probably wouldn't wear togas that had Winnie the Pooh on them. (PROSE: The Stone Rose)
The Tenth Doctor suggested meeting Winnie the Pooh in the Land of Fiction. (AUDIO: Infamy of the Zaross)
One of Pan's tattoos was of Winnie the Pooh. (PROSE: Combat Rock)
Behind the scenes
He was voiced by Stephen Fry in two audio drama adaptations in the 1990s.