The 21 episodes of series 1 and 2 were recorded on black-and-white videotape, with filmed inserts; but several of these episodes have been lost or wiped. The surviving episodes from Series 1 still exist as 405-line tapes, and those episodes featured on the 2015 DVD "A Man Alone" had proper electronic conversions to 625-line video, but the episodes have previously had poor quality optical conversions by merely pointing a 625-line electronic camera at a monitor displaying the original 405-line recording. The surviving Series 2 episodes also exist on 405-line videotapes, but for DVD these were electronically (as opposed to optically) converted. In the case of "The Worst Soldier I Ever Saw", Network's DVD cover blurb states that the episode only survives as an unedited studio block, which had to be edited into its proper sequence for the DVD release.