At the general election of 1820 Grosvenor, a devotee of the Turf and professional soldier, who drew £1,241 a year from the army, secured his eighth successive return for Chester on the interest of his cousin the 2nd Earl Grosvenor. The close contest was marked by his pronouncements against the ‘diabolical’ Cato Street conspirators and his fortuitous escape when the mob overturned his carriage into the River Dee.
He remained a very poor attender who voted infrequently and confined his few remarks to military matters. Like his colleague, Grosvenor’s heir Lord Belgrave, he cast a critical vote with the Whig opposition against the appointment of an additional Scottish baron of exchequer, 15 May 1820. On 26 June he was granted a week’s leave on urgent private business. He kept aloof from the controversies surrounding the duke of Wellington’s visit to Chester in December 1820 and the Queen Caroline case and is not known to have voted in 1821. That October a Chester common hall refused to elect him an alderman.
Grosvenor spoke in defence of the conduct of Lord Charles Somerset† as governor of Cape Colony, 7 Dec. 1826. During the ministerial uncertainty following Lord Liverpool’s stroke, he voted with his relations to postpone the vote on supply, 30 Mar., and refer the Irish miscellaneous estimates to a select committee, 5 Apr. 1827. He welcomed the Canning ministry’s decision to adopt a vote of thanks to the army in India and spoke highly of its commanders and of Wellington as commander-in-chief, 8 May 1827. He divided for Catholic relief, 12 May 1828, and for emancipation, 6, 30 Mar. 1829. Differing from Belgrave, he voted, 5 Apr., 17 May, and spoke, 16 June 1830, in favour of Jewish emancipation. In April Wellington passed him over for the vacant governorship of Blackness Castle.
His wife died, 26 July 1830, and, despite the initial disapprobation of his relations, in October 1831, at the age of 67, he married his former colleague Wilbraham’s sister, then ‘aged 40 and said to be an old maid, disagreeable, cross, and peevish’, upon whom £15,000 was settled.
I cannot live alone; and have been so fortunate to find a gentle lady that takes pity on my singleness ... The fact is (I speak for my humble self) I have done with all politics and public men and business. I shall shut my eyes to all newspapers and I must open them on something.
Draft in Grosvenor mss 10/4.
He became a field marshal in 1846 and died at his residence, Mount Arrarat, Richmond, Surrey, in January 1851, having bequeathed his land in Gloucestershire, Suffolk, Cambridgeshire and Surrey and almost all his personal estate to his widow.
