Horne took silk soon after leaving the House in 1818 and continued his distinguished career as a leader in chancery, which was punctuated by the deaths of his first wife in 1823, his father in 1824 and his mother in 1826, and by a second marriage. He was appointed attorney-general to Queen Adelaide in July 1830 and four months later, when the Whigs came to power, was chosen by lord chancellor Brougham to be their solicitor-general. Horne, who was known to be ‘a good Whig’ (though he did not join Brooks’s until 1835), was evidently quite willing to serve under the attorney-general Thomas Denman*, his professional junior.
Horne’s first task in the House, 23 Feb. 1831, was to make an impromptu defence of Brougham in his squabble with the metropolitan lunacy commissioners. On 21 Mar. he spoke at length in support of the ministerial reform bill, which he believed to be
perfectly safe and constitutional; and to furnish safe and adequate means of attaining the great object which we have in view, namely, the preservation of our constitution, the security of the throne, and the happiness and well-ordered liberty of the people.
He condemned the ‘vexatious’ series of adjournment divisions forced by the opponents of the revised bill, 12 July, when he was a government teller in the last of them. He was steady in his attendance during the bill’s passage through committee, but his contributions to debate were confined to very occasional observations on technical points.
He spoke in defence of government on the Russian-Dutch loan, 26 Jan. 1832, but, in the opinion even of friends, he had never performed worse and failed to make out ‘a tolerable case’.
In November 1832 Horne, who planned to stand for the new constituency of Marylebone at the forthcoming general election, was promoted to the post of attorney-general on Denman’s appointment as lord chief justice. Yet he was universally deemed to be ‘obviously unfit for it’, and it was only the failure of Brougham’s attempts to create a vacancy for him on the bench which prevented his being passed over for Campbell.
