The house remained in the Austen family until the mid 18th century when Robert Austen (1697–1743), the 4th baronet (Sheriff of Kent in 1724 and MP for New Romney from April 1728 to 1734), died and the estate was eventually purchased (c. 1772) by his brother-in-law Sir Francis Dashwood, a member of the notorious Hellfire Club.
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His father, William Harcourt Isham Mackworth (1806—1872), a younger son of Sir Digby Mackworth, the 3rd Baronet, took the additional surname Dolben after he married Frances, the heiress of Sir John English Dolben, the 4th Baronet.