Sherlock star Benedict Cumberbatch has revealed playing a politician in his latest film has not whetted his appetite to pursue any political aspirations.

Cumberbatch portrays William "Billy" Bulger the law-abiding brother of Boston mobster and FBI informant James "Whitey" Bulger in Black Mass, which premiered at the Odeon Leicester Square as part of the BFI London Film Festival.

He was joined on the red carpet by his wife Sophie Hunter, as well as his co-star Johnny Depp.