From Wikipedia, the free encyclopedia. Margaret Johnston  (10 August 1914, Sydney, Australia – 19 June 2002, Kingston upon Thames, England) was an Australian-born British actress. Johnston was most widely admired for her stage performances, but also appeared in 12 films and a handful of TV productions before retiring from acting in 1968 to devote herself to running a theatrical agency. Description above from the Wikipedia article Margaret Johnston, licensed under CC-BY-SA, full list of contributors on Wikipedia show more