This episode is partially lost. Originally stored on two 16mm film reels, each containing one half of the episode, the first of these two has now been lost. For the British Film Institute archive DVD of the entire series, a unique solution was found to enable the episode to be included in a comprehensible for. Original star Douglas Wilmer was engaged to read the original story on which the episode is based to camera, this material was edited and placed between the complete second reel and a recreated opening title sequence, cutting to the surviving footage at the appropriate point. The episode then concludes as originally recorded.