Utah's Sundance Film Festival is where Indie films premiere before they get bought by major film companies (Like Crazy, Napoleon Dynamite and even Four Weddings And A Funeral all started off there). The festival attracts the likes of Lena Dunham, Kate Bosworth and Harry Styles, so, we were mega-excited when it came to London two years ago. All the films can be seen at the The O2 this weekend, but ahead of their nationwide releases, here's how to work out which upcoming movies you should make a note of.