No 73, later retitled 7T3, is a British 1980s children's TV show produced by TVS for the ITV network. It was broadcast live on Saturday mornings and ran from 2 January 1982 to 27 March 1988. The show had an ensemble cast amongst others, Sandi Toksvig, Neil Buchanan, Patrick Doyle, Andrea Arnold, Kim Goody and Kate Copstick. imdb.com