Ever fancied owning the Joker's costume from Batman?

Some film memorabilia fetches millions of pounds at auction, but it can cost nothing to start a collection. A life-size replica of the Joker, as played by Jack Nicholson in the 1989 film Batman, leers down from a podium. His plum-coloured suit is unmistakable in its sinister glory. A few metres away, a mannequin sports a coral and maroon-hued cowboy outfit that looks like it's seen better days. It once belonged to fictional character Marty McFly and was worn by Michael J Fox in the 1990 film Back to the Future Part III.