Cavendish, a professional solder, remarried in 1819, shortly after the death of his first wife. But, even though his second wife was already a relation by marriage, his father Lord George Cavendish still persisted in ostracizing him on this account, writing to him, 4 Jan. 1820, that ‘I can only tell you that I am so much ashamed of you and disgusted with different parts of your behaviour in this business that reconciliation on my part would only be insincere and unavailing’.
it is of so much importance for me in every point of view to be in Parliament, that unless it can be otherwise arranged, I will avail myself of your kind wishes to return me again for Derby, and must in that case endeavour to struggle against the painful sensations I shall naturally undergo.
Devonshire, who believed Cavendish should be given a seat in priority to his brother Charles, duly returned him for Derby at the general election in March, when Cavendish’s father, who had declined to assist him in advancing his electoral ambitions elsewhere, angrily attempted to have Charles elected for Sussex.
He divided against the aliens bill, 7 July 1820, and steadily with opposition on the Queen Caroline affair during the following session. He voted for reducing the number of office-holders in the Commons, 9 Mar., and to ban civil officers of the ordnance from voting in parliamentary elections, 12 Apr. 1821. He divided for inquiry into Peterloo, 16 May, and the forgery punishment mitigation bill, 23 May. Having purchased a lieutenant-colonelcy in the 1st Life Guards, in July 1821 he commanded George IV’s escort at the coronation, being given strict orders to ride close to the royal carriage in case there were any violent attacks from supporters of the disgraced queen.
it was said that a soldier forfeited none of the privileges of a citizen, and surely one of those was the right of defending himself when he was attacked. The conduct of the Life Guards had been marked throughout by the utmost forbearance, nor had they employed violent measures, until they were compelled to resort to them in self-defence.
He divided for parliamentary reform, 25 Apr. 1822, 24 Apr. 1823, 27 Apr. 1826, and alteration of the Scottish representative system, 2 June 1823.
With discontent growing at his poor parliamentary attendance, owing to his military duties, Devonshire’s agent observed to James Abercromby* in March 1823 that ‘apologies on these grounds will no longer be admitted’.
He divided for Catholic relief, 6 Mar. 1827, and was (along with being in the list of the majority for repeal of the Test Acts on 26 Feb. 1828) again credited with such a vote on 12 May 1828. Although his attitude to the Canning ministry, which his father opposed, is uncertain, he was reported by Abercromby to have ‘voted right’, presumably meaning in favour of, the government’s bill to permit the temporary release of warehoused corn, 18 June 1827.
Cavendish was listed by ministers among their ‘foes’ and paired with the Irish solicitor-general John Doherty on the civil list, 15 Nov. 1830. He presented the reform petition from the corporation of Derby, 19 Mar., and divided for the second reading of the Grey ministry’s reform bill, 22 Mar., and against Gascoyne’s wrecking amendment, 19 Apr. 1831. Boasting that he had cast those votes ‘under a conviction that [the] measure ... would procure ... a just and ample representation in the Commons House of Parliament’, he was unchallenged at the ensuing general election.
