Downton Abbey star Jim Carter has given an update on the planned movie sequel, revealing that the cast has already read the script.Following the release of the first movie last year, talk of a follow-up has been rife, with producers ensuring fans that they were "committed" to another film.However, appearing on today's (September 24) This Morning, the Carson actor confirmed that a script existed, and they hoped to start filming next year."We've seen a script, a script for a second film is there,