Marsham, the son of a former Member for and the incumbent lord lieutenant of Kent, was returned unopposed for Hythe on a vacancy which neatly coincided with his coming of age. He apparently gave silent support to government until his defeat there in 1802. According to Joshua Wilson, his election for Downton a year later on Lord Radnor’s interest took place ‘without any previous knowledge on his own part’.
He opposed Ellenborough’s seat in the cabinet, 3 Mar., and did not vote on the repeal of the Additional Force Act, 30 Apr., but nevertheless received the support of the ‘Talents’ at the general election of 1806. On 14 Aug. Matthew White, the sitting Member for Hythe, told Lord Hawkesbury that Lord Grenville had ‘pointedly requested me not to create an opposition to Lord Marsham’s views of a seat’ there.
He retired from Hythe in 1807 and made no further attempt to enter the House. Despite his marriage in 1806 to an heiress ‘with a fortune of £60,000 and an estate of £12,000 per annum, independent of the estates of her father’,
