SPOILER. How Real Are The Events In

this film? I just saw NAKED...for the first time last night--tho I missed the first 20 minutes, which may have skewed my view of the film. Could NAKED...be Jake Brigg's script for a film or a play? Is he really telling us about events in his life or is this a highly fictionalized auto-biographical playscript or filmplay? There are some obviously surreal elements in the movie, which may be intended to alert us to the real nature of the movie.
Comments...should anyone drop by?

--Rayf