A descendant of a family known as much for its history of scandal and eccentricity as its political pedigree, Hervey had a perfunctory parliamentary career as Conservative Member for the western division of his native Suffolk.
Following the retirement of Harry Waddington, Suffolk West’s long-serving Conservative Member, at the 1859 dissolution, Jermyn’s supporters put his name forward as a prospective replacement at a meeting of Conservative electors, only for a majority to decide in favour of Major William Parker.
A frequent attender, who divided against the Liberal amendment to the address, 10 June 1859, Jermyn’s voting record did little to suggest that he was a ‘Liberal-Conservative’. He did vote with Gladstone in opposition to Du Cane’s motion criticising the commercial treaty with France, 24 Feb. 1860, but thereafter he consistently followed Disraeli into the division lobby on financial questions. He opposed Gladstone’s resolution to equalise the customs and excise duty on paper, 6 Aug. 1860, and backed Horsfall’s amendment to the tea and paper duties in the Liberal government’s budget, 6 May 1862. He voted against church rate abolition, 14 May 1862, and the tests abolition (Oxford) bill, 16 Mar. 1864, and repeatedly opposed Radical motions to extend the franchise. On foreign policy questions he believed that Britain should maintain ‘a dignified neutrality’ and backed Disraeli’s censure of government policy during the Danish war, 8 July 1864.
Like his father, Jermyn rarely spoke in debate. His most noteworthy contribution was his amendment to the appropriation of seats (Sudbury and St. Albans) bill, in which he argued that Sudbury, which had been disenfranchised in 1844, had been ‘made the scapegoat to bear the burden’ of the rest of the country’s ‘electoral sins’. Declaring that bribery still flourished, he argued that Sudbury’s abolition had been ‘an act of isolated severity’ and that the present government had no viable scheme for dealing with corrupt small boroughs. His amendment, however, was criticised as a blatant attempt to ‘resuscitate the defunct borough’ and was heavily defeated by 338 votes to 44.
Jermyn’s brief tenure as Member for Suffolk West ended when he succeeded his father as third marquess of Bristol in October 1864. He spoke occasionally in the Lords, where he earned a reputation as a committed advocate of the establishment of an international tribunal to arbitrate in national disputes.
Bristol died at Ickworth in August 1907, having been unwell with a chill since Easter.
