Affleck was the second and eldest surviving son of Gilbert Affleck of Dalham Hall, Suffolk and his wife Anna Dolben, daughter of John Dolben.
He was educated at Westminster School (1722), Christ Church, Oxford (1727) and studied law at the Inner Temple (1728).
[2] In 1743, Affleck was returned as member of parliament (MP) for Suffolk representing the constituency until 1761.
[1] In 1764 he succeeded his father to Dalham Hall, near Bury St Edmunds, Suffolk.
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