Banksy’s work now reportedly changes hands for millions. But he puts up his street art for free. Have you ever wondered what would happen if you got your hands on one of these? Does it mean you’ve found a winning lottery ticket or just scraped some worthless crap off a wall? Going up against the Art Establishment, Critics, Auction Houses, Gallery Owners and Authentication Boards in a quest for the elusive meal ticket, two filmmakers unwittingly gatecrash the murky and protective world of Banksy. “HOW TO SELL A BANKSY” raises questions of ownership, authentication and the true value of art itself. Through all the chaos and incompetence comes a modern-day, true-story, crime-theft, comedy-caper.

• Documentary