Calvert inherited a half-share in a Southwark brewery from his father, who shot himself in a Cheyne Walk coffee house in 1802.
He was a regular attender who continued to vote with the Whig opposition to Lord Liverpool’s ministry on all major issues, including parliamentary reform, 9 May 1821, 25 Apr., 24 June 1822, 20 Feb. 1823, 13, 26 Apr. 1826. He divided for Catholic relief, 28 Feb. 1821, 1 Mar., 21 Apr., 10 May 1825. Though he could not compete with the loquacity of his colleague Sir Robert Wilson, he intervened fairly frequently in debate, often to air matters of local concern. He spoke against the petition for a new London post office, 4 May 1820.
He concurred in calls for a revision of the Insolvent Debtors Act and quipped that his own forlorn condition was owing to the iniquities of the previous session’s Marriage Act, 14 Feb. 1823.
He presented a numerously signed Southwark petition for revision of the corn laws and a reduction in expenditure, 27 Feb. 1827.
At the general election that summer Calvert promised his support for Joseph Hume in Middlesex but declined to take an active part there, having a contest of his own to be concerned with.
He presented a petition from the parish of Christchurch for its inclusion in the borough of Southwark, 5 July 1831. He divided for the second reading of the reintroduced reform bill next day and steadily for its details. In the case of Saltash, where ministers failed to provide a clear lead, he voted in the minority for its complete disfranchisement, 26 July. He dismissed Alexander Baring’s qualms about the effects of the extended franchise, 3 Aug. He welcomed the addition of Christchurch to his constituency, 9 Aug. Adverting to the irregular manner of their appointment, he opposed the suggestion that the sheriffs of London should select returning officers for the metropolitan boroughs, 19 Aug., although he attested to the incorruptibility of the high bailiffs of Southwark. He urged close attention to the wording of the bill to avoid later disputes, 24 Aug., but foresaw no difficulties for new electors who needed to be rated before they could exercise the franchise, 26 Aug. He divided for the bill’s passage, 21 Sept., and Lord Ebrington’s confidence motion, 10 Oct. He voted to punish only those guilty of bribery at the Dublin election and against the motion censuring the Irish administration’s conduct, 23 Aug. He voted in the minority for Hunt’s motion for a committee of the whole House to consider the corn laws, 15 Sept. He divided for the second reading of the revised reform bill, 17 Dec. 1831, and steadily for its details, although he was in the minority for Hunt’s amendment to extend the franchise to all tax-paying householders, 2 Feb. 1832. He voted for the bill’s third reading, 22 Mar., and the motion for an address asking the king to appoint only ministers committed to carrying an unimpaired measure, 10 May. He presented a petition in favour of the anatomy bill, 31 Jan., and criticized the course of action pursued in opposition to it by the Surrey Member, John Briscoe, 11 Apr. He divided in the minority against a salary increase for the Irish registrar, 9 Apr. He presented a petition from St. Olave’s regarding the burden imposed on the poor rates by Irish immigrants, 3 June. He voted with ministers on the Russian-Dutch loan, 12, 20 July 1832.
Calvert died suddenly in September 1832 at his brother-in-law’s residence at Saxmundham, Suffolk, a notable victim of the cholera epidemic then sweeping the country. A medal was struck at the behest of his constituents, in memory of ‘their faithful representative’.
