Woody Allen has revealed that his latest film Blue Jasmine was sparked by an anecdote his wife told him.

The American filmmaker writes and directs the movie about a New York socialite whose life falls apart when her husband is revealed to be a crook.

Allen cast Cate Blanchett in the lead role, and says he had the Oscar-winning actress in mind while he wrote the script.

Watch Blue Jasmine on BT TV now.