Calvert inherited a half share in his father’s brewery in 1802 and was active in its management. In 1807 he contested Southwark on the interest abandoned by George Tierney after his defeat in 1806. He was unsuccessful, but did well enough to try again in 1812. This time he was at the top of the poll, receiving 2,180 votes from 2,740 electors, and he headed the poll until his temporary defeat in 1830.
Described to Lord Grey on his first return as ‘your personal supporter’,
On the refusal of the City Members to do so, Calvert presented the London livery petition for reform and retrenchment, 7 Feb. 1817, denying that he favoured annual Parliaments and universal suffrage, but insisting that ‘some reform was unquestionably necessary’. (He admitted, without specification, that he had been one of six electors who returned two Members to Parliament, each paying £4,500 for his seat.) On 25 Feb. he presented his constituents’ petition to the same effect. In March he was a subscriber to the proposed Whig evening paper.
Calvert signed the requisition to Tierney to lead the Whig opposition in 1818 and voted steadily with them again in that Parliament. He paired in favour of criminal law review, 2 Mar. 1819, and voted for inquiry into the abuse of charitable foundations, 23 June. He protested against the inequality of the coal duties, on his constituents’ petition, 2 Feb., 4 Mar., and on 9 June complained of the indirect taxes on beer, tobacco and tea as being hard on the poorer classes. The increased price of malt and hops had already raised the price of beer and the additional malt duty would ruin the maltsters, 10 June. On 13 Dec. 1819, presenting the Southwark petition against coercive legislation, he stated that he had not been able to get a word in against the bills until then and urged ‘that a little more allowance ought to be made for the distress of the manufacturers, all of whom ought not to be looked on as radical reformers’. He died of cholera, 8 Sept. 1832.
