A wealthy ironmaster and leading City financier, Thompson began his political career as a Whig before steadily drifting towards the Conservative party.
Thompson first entered parliament in 1820 as member for Callington in Cornwall, and staunchly defended Lloyd’s against its many critics. Elected for London in 1826, he had generally supported the Whigs, though his opposition to Catholic emancipation endeared him to the Tories.
At the 1832 general election Thompson was brought forward by the Conservative marquis of Londonderry for the newly created borough of Sunderland, a constituency where shipping matters dominated parliamentary campaigns. Although standing nominally as a Conservative, he spoke in favour of the secret ballot and called for repeal of the corn laws.
A steady attender, Thompson’s votes in his first Parliament reflected the ambiguity of his politics. He voted against the abolition of military sinecures, 14 Feb. 1833, and shorter parliaments, 15 May 1834, but for the ballot, 25 Apr. 1833, and for a fixed duty on corn, 7 Mar. 1834. He was against Attwood’s motion for currency reform, but subsequently voted in the minority for a select committee on distress among the industrious classes, 24 Apr. 1833. He opposed the Whig government over Althorp’s motion to replace church rates with a land tax, 21 Apr. 1834. In February 1835 he was described by the Examiner as one of the ‘doubtful men’ in the Commons, as ‘the Tories stick to Alderman Thompson, but the Alderman by no means consents to cleave to them’.
Thompson spoke frequently on banking and shipping issues. In his later parliamentary career he was a vocal opponent of the Bank Charter Act, but in the 1833 session he backed the Grey ministry’s bank charter bill, 2 Aug. 1833, and spoke in support of Althorp’s proposal to make Bank of England notes legal tender, 9 Aug. 1833, though he warned that the bank’s circulation needed to be increased if the proposals were to work, 1 July 1833. He was more critical of the London and Westminster bank bill, which he argued would interfere with the privileges of the Bank of England, 7 and 26 May 1834. Reflecting his staunch defence of the shipping interest, he warned against any reform of the timber duties, 4 Mar. 1834, 24 Mar. 1835, and backed George Young’s motion to repeal the Reciprocity Act, which he claimed had been ‘most injurious to our commercial interests’, 5 June 1834. He was appointed to many select committees, including those on manufactures, commerce and shipping, the bankrupts estates bill, timber duties, and accidents in mines.
Re-elected in first place at the 1835 general election, Thompson was listed in the Parliamentary test book (1835) as a ‘Reformer’, and in 1836 he told Dod he was of ‘Liberal political opinions’.
Thompson’s attitude towards the corn laws shifted during Melbourne’s second administration. He was in the minority for Clay’s motion on the corn laws, 16 Mar. 1837, and spoke in favour of a motion for foreign corn bonded in Britain to be ground and manufactured for export, explaining that ‘though he was no friend to the corn laws, he would not be a party to any indirect measure against them’, 20 Mar. 1838. However, he divided against Villiers’ motion on the corn laws, 18 Mar. 1839, and thereafter opposed repeal. He continued to speak out against any alteration in the timber duties, 26 Feb., 10 Mar. 1836, and warned that as the shipping interest was ‘second to none in this country’, any transfer of the timber trade from the colonies to the Baltic would ‘inflict serious injury on British manufactures’, 9 July 1839. By 1841 his staunch advocacy of protectionism was evident, and he intervened in the budget debate to ridicule ‘the position that by cheapness of food, pro tanto, the consumer was benefitted’, 30 Apr. 1841. He voted for Peel’s motion of no confidence in the Whig ministry, 4 June 1841. Reflecting his commercial expertise, he served on select committees on the state of the coal trade, the port of London, the shipwrecks of timber ships, and the Thames embankment.
At the 1841 general election Thompson was returned for Sunderland without opposition, but in September that year he resigned his seat to contest a vacancy in his native Westmorland.
At the 1847 general election, when he was returned unopposed, Thompson delivered an unwavering defence of the navigation laws, declaring that if they were repealed, the country ‘would be converting a brave and most valuable class of their fellow subjects into paupers, and our fine fleet of merchantmen into firewood’.
Thompson, who was now an infrequent attender, divided with Disraeli on most major issues.
Thompson died at Bedwellty House, Monmouthshire in March 1854, in consequence of a cold caught while visiting his iron works.
