The final piece of the Regal tea set is this White Rabbit sugar bowl. Odd that they did not use a different character for this piece, again I would have thought the March Hare or Dormouse would have made more sense. I think a Mad Hatter tea pot deserves a March Hare creamer and a Dormouse sugar bowl, don't you?
The White Rabbit's head is the lid for this bowl, very fitting given the Queen's favorite sentence.
It has been my experience that this piece is the rarest of the Regal tea set, not the Mad Hatter tea pot.