18. Asa Butterfield
Age: 16Nationality: EnglishMost notable role: Ender (Ender's Game) One of the most talked about young actors in Hollywood, Asa Butterfield may have only just made headlines for Ender's Game, but he's been acting half his life: he was in The Boy in Striped Pyjamas, Hugo and even BBC's Merlin. It's hard to believe he's still only 16 years old, especially given his presence on screen, and his knack for an American accent. Next year sees him take the lead role in X Plus Y, and in 2015, he'll reportedly star in The White Circus opposite Chloe Grace Moretz (Kick-Ass). And that's not taking into account the fact that he's probably receiving endless strings of offers at the moment after Ender's Game: could he reunite with Harrison Ford for the next Star Wars film? Either way, it's only a matter of time before he's one of Britain's biggest film stars.
17. Natalie Dormer
Age: 31Nationality: EnglishMost notable role: Margaery (Game of Thrones) An actress who's already well known to TV fans for her roles in Game of Thrones and The Tudors, Natalie Dormer may be on the cusp of super-stardom. Following from roles in Captain America and Rush, she'll be starring in The Girl Who Invented Kissing alongside Star Trek star and Sylar himself Zachary Quinto next year, and Posh, alongside fellow Hollywood Brit, Sam Claflin. And then there's the small matter of appearing in the last two films in the Hunger Games series as Cressida. Like Jennifer Lawrence herself, Dormer's effortlessly charismatic, and the films may help to launch her Hollywood career even further.