It was built by the Thames Navigation Commission in 1773, The lock is named after the village of Hambleden, a mile (1.5 km) to the north.
Smith is the son of William Smith and Countess Maria Carmela Attolico di Adelfia.
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He separated from his wife in 2003 and returned to Hambleden, Buckinghamshire, England.
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Through his paternal grandmother, he is a descendant of the Earls of Pembroke and the Vorontsov family.
Smith was the son of William Smith, 3rd Viscount Hambleden, and his wife, Patricia née Herbert, a descendant of the Earls of Pembroke and the Vorontsov family.
William Henry Smith, 5th Viscount Hambleden, known as Henry Smith (born 18 November 1955), is a British peer, and descendant of the founders of the stationery group W H Smith.
William Herbert "Harry" Smith, 4th Viscount Hambleden (2 April 1930 – 2 August 2012), was a British peer and descendant of the founders of the stationery group W H Smith.