Pen's Nest

Twice lately I've seen references to 'The Leaky' in a Harry Potter context, and it makes me wrinkle my nose. Is there canon for referring to The Leaky Cauldron as 'The Leaky'? I have certainly forgotten a lot of Harry Potter stuff, so it is possible there is canon, but I am inclined to believe it is a fannish thing that some bright spark thought up and which has been taken up enthusiastically by people who don't know better.

Surely a British crowd of magical pub-goers would refer to it as 'The Cauldron'. I mean, imagine we were referring to the Golden Dragon. We'd say The Dragon, not The Golden.

*irked*