Dundas, a thoroughgoing Whig like the rest of his family, had given up his seat at Malton in 1812 in order to pursue a military career. However, in the autumn of 1824 his uncle Lord Fitzwilliam settled on him as a candidate for East Retford, and he was returned there at the general election of 1826 after a contest which was marked by physical violence and extreme anti-Catholic feeling, directed towards him and his colleague William Battie Wrightson.
He divided for Catholic relief, 6 Mar. 1827, thereby provoking further disturbances in East Retford.
The ministry regarded him as one of their ‘foes’, but he was absent from the crucial division on the civil list, 15 Nov. 1830. It seems inconceivable that he delivered the anti-reform speech attributed to him by Parliamentary Debates and the Mirror of Parliament, 21 Mar. 1831. He voted for the second reading of the Grey ministry’s bill the next day, and against Gascoyne’s wrecking amendment, 19 Apr. 1831. At the ensuing general election he was returned once more for Richmond. He divided for the second reading of the reintroduced reform bill, 6 July, and steadily for its details, its passage, 21 Sept., the second reading of the Scottish bill, 23 Sept., and Lord Ebrington’s confidence motion, 10 Oct. 1831. He voted to prosecute only those found guilty of bribery at the Dublin election and against the motion condemning the Irish administration for using undue influence, 23 Aug. He divided for the second reading of the revised reform bill, 17 Dec. 1831, its details, and the third reading, 22 Mar. 1832. He was absent from the division on the motion for an address asking the king to appoint only ministers committed to carrying an undiluted measure, 10 May. He voted for the second reading of the Irish bill, 25 May, and against the Conservative amendment for increased Scottish county representation, 1 June. He divided with ministers on the Russian-Dutch loan, 26 Jan., 12, 16, 20 July, and relations with Portugal, 9 Feb. He voted in committee against the Sunderland wet docks bill, 2 Apr. 1832.
Dundas continued to sit for Richmond until the dissolution in 1834 and came in again on a vacancy in 1839, finally retiring in 1841. He died in November 1844. He left Long Hall, near Guisborough, Yorkshire to his sister Frances Chaloner and Loftus Hall and the residue of his personal estate to his nephew Thomas Dundas*, 2nd earl of Zetland.
