Metro Goldwyn Mayer ; United Artists ; the Mirisch Corporation presents ; a Norman Jewison production ; a Mirisch-Simkoe-Solar production ; written by Alan R. Trustman ; produced and directed by Norman Jewison
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