Long was returned for Marlborough on the interest of his friend Lord Bruce (later Earl of Ailesbury). Like his father, he was classed in Bute’s list as a Tory, and voted against the peace preliminaries, 9 and 10 Dec. 1762, but unlike him does not appear in any other minority list 1763-4, possibly because of absence abroad. Lord Holland wrote to Lord Sandwich, 2 Oct. 1763:
The Public Ledger wrote of him in 1779:
He is not celebrated for a peculiar attention to his parliamentary duties, but with less activity possesses also less of that genuine patriotic ardour which has characterized the majority of his ancestors. Although he deviates, however, from the prescriptive line of political sentiments which his predecessors have pursued, it is not all [sic] doubted that he resembles and equals them in the integrity of his intentions and the sincerity of his conduct. He is strongly attached to the Aylesbury family, and it is believed to be partly owing to the influence of that connection that he has undergone an involuntary bias against the doctrines of his family.
He voted with Opposition on economical reform, 8 Mar. 1780, and the abolition of the Board of Trade, 13 Mar. 1780, but with Administration on Dunning’s motion, 6 Apr. 1780, and the motion against prorogation, 24 Apr. 1780; and in Robinson’s survey of July 1780 was classed as ‘pro’. On 1 Sept. 1780, on hearing the news of the dissolution, Ailesbury wrote to Long:
You must recollect your declaration to me at the last general election with regard to your seat in Parliament if my son had been of age. As that event will happen, please God, March two years, I should be glad to know whether it will be agreeable to you to continue one of the representatives for Marlborough until that time. I know there were instances at the last election ... of minors being chosen a year or two before they were of age, but I should prefer the more usual method of vacating a seat if you have no objection to being elected on that footing.
Long preferred to seek another constituency, and was returned unopposed for Devizes. He voted regularly with Administration till the fall of North; against Shelburne’s peace preliminaries, 18 Feb. 1783, but was absent from the division on Fox’s East India bill, 27 Nov. 1783. Robinson noted in his electoral survey of December 1783 that Long’s ‘inclinations are with Government’,
After his death (aged 57) on 28 Nov. 1794, the Gentleman’s Magazine (1794, p. 1154) wrote of him:
Formed, by nature and by habit, for an honourable and useful retirement, he felt very little relish for the gay and splendid scenes of what is called high life ... His great accession of fortune a few years before his death ... certainly made no addition to his happiness. Accustomed from principle and from virtuous habits to live within the bounds of his paternal income, he would have been well content to have preserved to the end that character of uprightness and respectability, as a private country gentleman, which he had maintained in his native county.
