In several episodes, an ambulance featured in the plot. It was always the same vehicle, carrying the fictitious registration number SJA 374R, SJA 374S (The Sweeney: Loving Arms (1976)) or SJA 374T (The Sweeney: Bait (1978)), with the suffix letter changing according to the year of filming because it denotes the year of registration. SJA stands for St John Ambulance, who owned the vehicle, and 374 is 374 Division, based at Kingston Upon Thames.