E.L.James’ saucy novel Fifty Shades of Grey first burst on to the literary scene earlier this year, and together with sequels Fifty Shades Darker and Fifty Shades Freed has notched up an impressive 30 million sales, surpassing Harry Potter as the fastest selling book of all time. First written as an anonymous piece of Twilight fan fiction, excitement around the book, dubbed ‘mummy porn’ has quickly reached fever pitch. And then there’s the question of the film. A Fifty Shades movie has been given the go-ahead, after the rights were snapped up by Universal Pictures – which swiftly sent Hollywood into a frenzy over which famous leading man would bag the role. So far, everyone from Robert Pattinson to Ryan Gosling and Christian Bale is in the running – but which A-list heartthrob will bag the sought-after part?