Hornby, whose estates straddled the Lancashire-Westmorland border, had devoted much of his life and skills as a barrister to promoting the Derby interest, and he continued to assist their candidates at elections between 1820 and 1832. The nephew and son-in-law of the Whig 12th earl and brother-in-law twice over of his son Lord Stanley*, he and his family were frequently at Knowsley and, since Lord Stanley’s transfer to the county in 1812, he had represented Preston on the coalition (Derby-Horrocks) interest, as locum for his nephew Edward George Geoffrey Smith Stanley*. He did not intend to stand again, but agreed to do so when George III’s death necessitated a general election shortly before Smith Stanley came of age in 1820.
Generally acting with Lord Stanley, Hornby adhered to the main Whig opposition in the 1820 Parliament. He divided for Catholic relief, 28 Feb. 1821, 1 Mar., 21 Apr., 10 May 1825. He voted to make Leeds a scot and lot borough under the Grampound disfranchisement bill, 2 Mar., for Lord John Russell’s reform proposal, 9 May (but not Lambton’s, 18 Apr. 1821), and again for reform, 25 Apr. 1822, 24 Apr., 2 June 1823, 26 Feb. 1824, 27 Apr. 1826. In a rare speech, 7 Mar. 1821, he denied, as one of the visiting magistrates, the radical Nathan Broadhurst and his fellow petitioners’ allegations of maltreatment in Lancaster gaol. He justified on grounds of economy and security the practices of putting prisoners to work, denying them newspapers and opening their mail. He was named to select committees on prisons, 30 Mar. 1821, 5 Mar. 1822, 14 May 1823, 1 Mar. 1824. Opposing the cotton factory bill, 16 May (after presenting unfavourable petitions on the 13th), he argued that as adult and child labour were interdependent, the proposed reduction in children’s working hours would disrupt production at great cost, without benefiting the children it purported to assist. Despite their political differences, he supported the nomination of the anti-Catholic Tory barrister Thomas Greene* of Slyne, a fellow lobbyist for keeping the assizes at Lancaster, at the by-election there in 1824. Doing so, he explained that as ‘much of the important business of the House was transacted without the walls of St. Stephen’s, it was important to recruit men of Greene’s calibre to serve on committees.
Alluding to their adherence to Lord Goderich’s ministry, he observed to Smith Stanley, through whom he sought patronage, 8 Dec. 1827, ‘I always found it a great advantage of being in opposition, that it furnished me with a ready answer to all applications’.
