Seasons 1, 2 and 3 consisted of two 26-minute episodes per week (each shown with one commercial break in a 30-minute slot) and the two episodes had the same title. Season 4 was shown as a single 52-minute episode per week (shown with two commercial breaks in a 60-minute slot).
Jack Watling played two totally different characters: in Season 3 he played Julian Palmer; in Season 4 he took over from Philip Latham playing regular character Arthur Bourne.