VIDEO : Exclusive Interview: Colin Firth discusses how great it was to work with Elton John on 'King

The new blockbuster sequel 'Kingsman: The Golden Circle' is just about to hit cinemas, and along with big names like Channing Tatum, Julianne Moore and Colin Firth, it also features music legend Sir Elton John in what's said to be his biggest acting role ever. In this exclusive interview, Colin discusses how great it was to work with the singer on set.