Greenlit Productions, produced in association with Paddock Productions ; produced by Simon Passmore and Jill Green ; written and created by Anthony Horowitz ; directed by Jeremy Silberston and David Thacker
a Hartswood Films production for BBC Wales in co-production with Masterpiece ; co-created by Mark Gatiss & Steven Moffat ; written by Mark Gatiss, Steven Moffat and Steve Thompson ; series producer Sue Vertue ; executive producers Beryl Vertue, Steven Moffat, Mark Gatiss, Bethan Jones ; directed by Jeremy Lovering, Colm McCarthy, Nick Hurran
created by Anthony Horowitz ; written by Anthony Horowitz and David Kane ; produced by Jeremy Gwilt ; directed by Stuart Orme and Andy Hay ; Eleventh Hour Films in association with Acorn Media Group, Inc. and Octagon Films Limited