The surprise blockbuster has quietly raked in over $400 million (£250 million) at the global box office, and bosses at Fox are hoping to duplicate that success with a planned sequel, according to

It's not yet clear if Firth will reprise his role as secret agent Harry Hart in the action comedy.

Kingsman: The Secret Service, which is based on the comic book The Secret Service, also featured Samuel L. Jackson and Michael Caine, whose characters were killed in the original movie.