After the war, Lord Leveson joined Coutts & Co., a private bank.[1]
On 25 June 1953, he succeeded his father as Earl Granville (created 1833), Viscount Granville (1814), and Baron Leveson of Stone (1814), giving him a seat in the House of Lords.[1]
In 1958, Granville married Doon Aileen Plunket, daughter of Brindsley Sheridan Bushe Plunket and granddaughter of William Plunket, 5th Baron Plunket. Her mother was Aileen Sibell Mary Guinness, a granddaughter of Edward Guinness, 1st Earl of Iveagh. They had three children:[1]
In 1960, shortly after the birth of his first child, Granville bought the island of North Uist in the Outer Hebrides from the Duke of Hamilton, becoming its laird. Settling there, he built himself a new house, Callernish, near Lochmaddy, designed by the architect Sir Martyn Beckett.
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In 1974 Granville was appointed as a Deputy Lieutenant of Inverness-shire[1] and was Vice-Lord-Lieutenant of the Western Isles between January 1976[3] and 1983, then Lord-Lieutenant from 1983[4] to December 1993, when he was succeeded by Viscount Dunrossil.[5]