 He played several roles in the 1966 Doctor Who story "The Celestial Toymaker", and made two appearances in different roles in the popular television series "Dad's Army", including as corrupt politician Sir Charles McAllister.He also featured as Mr Finney in a "Some Mothers Do 'Ave 'Em" Christmas Special, and played a lodger in an episode of "On the Buses".As a writer, Singer co-authored several plays with George Ross, including "Guilty Party", "Difference of Opinion" and "Any Other Business", some of which were also televised.