I doubt there has ever been a potentially more exciting foreign collection of Art Exhibitions in London than there is now. I am planning a trip to them all and will let you know what I think.

Rodin at The Royal Academy

Holbein at Tate Britain

Leonado Da Vinci at The Victoria and Albert Museum

Velázquez at the National Gallery

(If you really want to get excited you could impress someone and visit the Turner Prize Exhibition.)