"Genealogical Memoir of Lady Augusta Wentworth". The Court Magazine and Monthly Critic; Containing Original Papers, by Distinguished Writers, and Finely Engraved Portraits and Landscapes, from Paintings by Eminent Masters. X: 223. 1837.
historyofparliamentonline.org
Rev Francis told his grandfather in 1771 that his lordship had "absolute power" over the burgesses. Constituency of Marlborough, 1754-90 at History of Parliament Online