Davidson’s grandfather, Duncan Davidson (1733-99), a London West India merchant with premises at 14 Fenchurch Buildings and the owner of Tulloch Castle, Ross-shire following the death of his elder brother and business partner Henry in 1781, was Member for Cromartyshire in the 1790 Parliament.
By then Davidson, who had had a conventional education and bought a commission in the Guards, was a Member of Parliament. In September 1825 he had surprised Sir James Wemyss Mackenzie of Scatwell, Member for Ross-shire, by seeming to hint at an intention of standing for Inverness Burghs at the next opportunity.
At the Ross-shire county reform meeting, 24 Dec. 1830, Davidson unsuccessfully proposed its adjournment on a technicality. At the anti-reformers’ meeting, 24 Mar. 1831, he stated his objections to the Grey ministry’s reform scheme, notably its proposed £10 householder franchise, and by request moved the resolution condemning the measure as ‘too sweeping’ and ‘partial’. He elaborated these views at a Dingwall meeting, 5 Apr., when he complained of the Scottish bill’s ‘unjust and unsafe propositions’, suggesting that it contravened the Act of Union, but professed willingness to support ‘a safe, salutary and just measure of reform’.
He voted against the second reading of the reintroduced English reform bill, 6 July, twice for the adjournment, 12 July, for use of the 1831 census in defining the disfranchisement schedules, 19 July, to postpone consideration of Chippenham’s inclusion in B, 27 July, in a minority of 38 to preserve the voting rights of non-resident freemen, 30 Aug., and against the passage of the bill, 21 Sept. 1831. He voted to censure the Irish administration’s interference in the Dublin election, 23 Aug., for inquiry into the effect of renewal of the Sugar Refinery Act on the West India interest, 12 Sept., and against the second reading of the Scottish reform bill, 23 Sept. He was absent from the division on the second reading of the revised English bill, 17 Dec. 1831, but divided against the enfranchisement of Tower Hamlets, 28 Feb., and the third reading, 22 Mar. 1832. He voted against the malt drawback bill, 2 Apr., and the second reading of the Irish reform bill, 25 May. On the Scottish bill, 15 June, he divided the House against the annexation of Cromarty to Ross-shire, but was defeated by 50-26. He obtained a month’s leave on account of illness in his family, 10 July 1832.
Davidson retired from Parliament at the dissolution in December 1832. At the election for the new constituency of Ross and Cromarty he seconded the nomination of the unsuccessful Conservative candidate, attacked the government and asked, ‘Because the party with whom he usually acted were out of favour, was he basely to desert them?’
