Director: Bharat Nalluri Starring: Kit Harington, Peter Firth, Jennifer Ehle, Tuppence Middleton, Tim McInnerny, David Harewood Written by: Jonathan Brackley and Sam Vincent Running Time: 104 mins Cert: 15 Release date: 8th May 2015 TV spin-offs (popular shows that were given big screen treatments) always suffered from the same problem: taking something set in one…