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This is just a short blip in a Vanity Fair video (from the time he was included in the Vanity Fair Hollywood issue) when they asked a number of celebrities who they would like to see play themselves in a film.
Ben's answer starts about the 43 second mark. I love how he compliments someone else's work before answering.
Here's the link -
Just in case you couldn't hear it properly his answer is "Andrew Buchan" who if you look him up is a pretty good choice actually - right age, about Ben's height, trained in the theatre, has a facial shape like Ben (although I don't think he is nearly as handsome or interesting in his features) and seems to have acting "chops" as they say with some a fairly impressive CV.
-Val