King secured his unopposed return for the county through the influence of his elder brothers, Lords Kingston and Erris. He voted with the opposition minority in favour of inquiry into the Prince of Wales’s finances, 4 Mar. 1803. He was thought likely to support Pitt’s administration in 1804 and in December of that year reckoned a supporter, but reported on board the Ariadne off Le Havre on naval duty,
In 1806, when King was on convoy duty, it was thought that his family would secure his support for the Grenville ministry, but they failed to secure his re-election in absentia, then or in 1807. He died at Barbados in November 1807.
