Charlie Hunnam

Will Smith has been targeted by people on social media for his new film Concussion, in which he plays the real-life Dr. Bennet Omalu, a Nigerian forensic pathologist who was the first person to diagnose a brain damage condition in NFL players.

Some actors have the wonderful skill of changing themselves, chameleon-like, to fit into any role they turn their hands to, including putting on an accent that even locals would think was authentic.

Hugh Laurie, Idris Elba, Emma Watson and Andrew Garfield are amongst the Brits who have crossed the pond and nailed the stateside accent.