Tony Carpenter is a self-made millionaire who turned his South London minicab firm into a successful chauffeur-driven car service. He lives in a large detached mansion in Esher, surrounded by Rolls Royces and BMWs, with a domestic staff who respect him, and whom he adores; Witty and insolent butler/driver Sam (who is also a childhood friend of Tony), acerbic secretary Maggie and cook Mrs Wembley (responsible for the series' catch-phrase of "Just the one", used to respond to the offer of a sherry even if it was her third or fourth).