Returned by his father Lord Darlington for Winchelsea in 1812, Powlett had in 1815 been substituted for his elder brother Lord Barnard as Member for county Durham, where he was only occasionally resident. He had generally followed Darlington’s Whig, pro-Catholic line, shared his reservations on parliamentary reform and had shunned public meetings. As directed by him, he voted for the repressive legislation introduced by Lord Liverpool’s administration after the Peterloo massacre. Powlett’s return for county Durham was severely compromised in 1820 by the Tory challenge to his Whig colleague John George Lambton*, who afterwards claimed the credit for ensuring that he was not defeated at the poll.
Although Powlett was a West India proprietor, he voted in condemnation of the indictment in Demerara of the Methodist missionary John Smith, 11 June 1824, and of the Jamaican slave trials, 2 Mar. 1826, and voiced support for Canning’s 1823 resolutions when presenting abolitionist petitions, 4 Mar., 25 May 1824, 18, 20 Apr. 1826.
Powlett was abroad in the summer of 1826 when reports first circulated of the failure of John Wilks II’s* ‘bubble’ Cornwall and Devon Mining Company, of which he was a director. Keen to avoid seeing his name ‘dragged before the public on a subject which I admit was a pecuniary investment’, he sought advice from the Whig lawyer Henry Brougham, whom his father’s had returned for Winchelsea. Acting on it, he delivered a robust defence of his conduct which was loudly cheered, when he was implicated with his fellow director Lord Palmerston* in a hostile petition from the company’s shareholders, 9 Apr. 1827.
Commenting to Brougham on the incoming Wellington ministry, to which the Huskissonites adhered, 11 Jan. 1828, Powlett conceded the impossibility of forming an exclusively Whig government:
Huskisson is essential to an administration and if his system and principles can be maintained I hope most devoutly we shall not be split. For a good strong government is so very desirable in the present state of things and with energy and firmness I have no doubt we shall conquer all our difficulties. I am only fearful Peel will be placed at the head, and then however fair and plausible his conduct may appear, we must know Ireland cannot be tranquillized.
Brougham mss.
Toeing the family line, he refrained from deliberate hostility to ministers in 1828 and, according to their secretary at war, Sir Henry Hardinge*, he ‘gave in a general adhesion’ to them at the close of the session.
Most constituency business devolved on Powlett after the Whig William Russell, whose candidature Cleveland had approved, became his colleague following Lambton’s elevation to the peerage in February 1828 (as Lord Durham).
As the patronage secretary Planta predicted, Powlett divided ‘with government’ for Catholic emancipation, 6, 30 Mar., and he commended its concession on introducing a favourable petition from Sunderland, 9 Mar. 1829. He voted to transfer East Retford’s seats to Birmingham, 5 May 1829 (and again, 11 Feb. 1830); and when this was rejected he opposed the new writ and declared for sluicing, 7 May 1829.
Ministers included Powlett among the ‘good doubtfuls’ and he divided in their minority on the civil list, 15 Nov. 1830. He presented numerous anti-slavery petitions, 11, 15, 17, 23 Nov., and several for repeal of the coal duties, 16 Nov. 1830, criminal law reform, 9 Feb., and against the register of deeds bill, 9 Feb. 1831. He endorsed one from the Sunderland ship owners for amending the timber duties, 14 Mar., and reiterated their case for continued protection for the Canada trade, 15 Mar. Cleveland had declared for the new Grey administration in December 1830, and Powlett, as requested, signed the requisition for and attended the county Durham reform meeting, 1 Feb. However, like Thomas Henry Liddell, the former Canningite Member for Northumberland, with whom he had travelled there, he spoke against wholesale disfranchisement and for transferring single Members from small depopulated places to manufacturing towns and an extended franchise. He promised to present and endorse petitions from Durham and the county requesting the ballot, although his views were ‘at variance with those of many other reformers’, and did so, 9 Feb.
He settled at the Powlett (Bayning) estate of Downham Hall, Norfolk, and unlike Darlington, who came in for Shropshire South as a Conservative in 1832, he did not stand for Parliament again in the lifetime of his father, whom Grey rewarded with a dukedom in January 1833. He came in for St. Ives as a Liberal Conservative in 1846 and Ludlow in 1852 on the interest of his brother, now 2nd duke, to whose titles and entailed estates he succeeded in January 1864. He died eight months later, recalled as a ‘kind hearted man’ much ‘respected in racing circles’.
