Althorp was returned for Northampton in 1780 on the family interest. Brother-in-law of William, 5th Duke of Devonshire, he was associated politically with Rockingham and the Cavendishes. In 1782 he took a prominent part in the final opposition onslaught on North’s Government, seconding Conway’s motions of 27 Feb. and 4 Mar. He became a lord of the Treasury under Rockingham, and in April vacated his seat to stand for Surrey, where he was returned unopposed. ‘He is very popular from his character’, wrote his father-in-law, ‘and will owe his election in the county to it, as he scarcely knows any man or freeholder in Surrey except those about Wimbledon Park.’
He died 10 Nov. 1834.
