Venables-Vernon was a member of the queen's council who had charge of George III during his illness. He was an eloquent speaker, and occasionally spoke in the House of Lords on ecclesiastical matters, but usually abstained from political contentions. He lived under five successive monarchs, and was respected for benevolence and simplicity of character. On 15 January 1831 he took the surname of Harcourt only on inheriting the large estates of the Harcourt family, which came to him on the death of his cousin, Field-marshal William, third and last Earl Harcourt.