This film has not been seen since it's original broadcast, as it falls within the period when the BBC encouraged the wiping of all tapes for new content. It has been assumed that all copies no longer exist, as none have been found.
Toby Hadoke's adaptation of Kneale's script was broadcast on BBC Radio 4 on 27th October 2018. Mark Gatiss played Gideon Cobb and Adrian Scarborough was Sir Timothy Hassall. Director was Charlotte Riches.