Viewers of Mastermind were left frustrated after a contestant’s choice of a specialist subject sparked outrage online. During the Monday night quiz show, Mastermind , where contestants answer difficult questions on a specialist subject and general knowledge, a range of topics were covered, from Henry II to Agatha Christie’s Miss Marple mysteries, as well as Welsh rugby union test matches. But it was Gary Austin, a retired teacher, who caused a stir with his choice of subject: the TV sitcom