written by Tony Marchant and Damian Wayling ; co-created by Tony Marchant ; directed by Ashley Pearce ; produced by Nick Pitt ; Twenty Twenty Productions Ltd. ; Shed Media Scotland ; BBC
Kudos Productions Ltd. ; in association with BBC America ; written and created by Abi Morgan ; produced by Ruth Kenley-Letts ; episode directors, Coky Giedroyć, Harry Bradbeer, Jamie Payne
2 entertain ; British Broadcasting Corporation ; BBC Worldwide Ltd. ; producers, Kevin Bishop, Nick Symons ; [written] by Stephen Fry & Hugh Laurie ; director, Kevin Bishop
BBC ; writers, Paul Logue, Paul Matthew Thompson, Martha Hillier ; directors, Paul Gay, Lawrence Gough, Carolina Giammetta, Declan O'Dwyer ; producer, Will Nicholson
a BBC Cymru Wales Drama Production ; executive producers, Brian Minchin and Steven Moffat ; directed by Jamie Payne ; written by Steven Moffat ; produced by Marcus Wilson