From Wikipedia, the free encyclopedia. Mary Webster is a British actress best known for her 45 appearances as Sarah Onedin in the BBC nautical drama The Onedin Line (1971-79). Webster's first television appearance was in The Man from the South for Cameo Theatre (1955). She went on to appear in, among others, A Christmas Carol (1958), William Tell (1958), The Moonstone (1959), Dixon of Dock Green (1963), Dr Finlay's Casebook (1963), Redcap (1964), Danger Man (1965), The Troubleshooters (1966...
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