on November 29th, 2013 at 02:46 pm
I thought it was pretty clear that Liz Osgood was the Curator's companion. And the Curator was a regeneration of the Doctor, far in the future of his own timeline. Returning, as he actually said, to a favorite old face. The scarf is a dead giveaway. We already know that the Doctor keeps a huge wardrobe in the TARDIS, including all his own old clothes.
And you are 100% correct that THAT was not Elizabeth Tudor, in any timeline. She was not cuddly. Though she almost certainly was passionate.