Marjoribanks was a leading figure in the commercial life of Edinburgh, where he was a partner in his father-in-law’s banking house. His election for Berwickshire in 1818 had been approved by the Liverpool ministry’s Scottish manager Lord Melville and was widely resented, and plans were made to oppose him at the next election. However, he came in unopposed in 1820, when he was joined in the House, as Member for Hythe, by his brother, the Whig banker Stewart Marjoribanks.
He echoed his constituents’ pleas for repeal of the additional Scottish malt duty, which he complained had been rushed through in the absence of most of the Scottish Members, 5 July, and proposed an amendment to extend the scope of the Scottish malt allowance bill, but it was ruled out of order, 13 July 1820. (On 19 Apr. 1823 he was added to the select committee on Scottish petitions against the duty, which he said had been ‘very injuriously felt’, 20 June 1823).
Marjoribanks’s involvement in urban development in Edinburgh twice landed him in scrapes in the House. On 27 June 1821 he was accused by Joseph Hume of complicity in a dubious transaction with the treasury over the sale of the site, which he had acquired, selected for the construction of a new stamp office. In an ‘indistinct manner and tone’ he denied that there had been any ‘dirty work’, professed that he ‘could not have been more astonished to find himself in a watch-house on a charge of picking a pocket’, and complained that he ‘had been detained in London, while his family was in Scotland, merely to wait the commands and pleasure’ of his accuser.
Marjoribanks did not stand for Parliament again. He aligned with the reformers in Berwickshire and Roxburghshire in 1831, displayed largesse as a local benefactor and, assisted by his brother, successfully promoted the candidature for Berwickshire of his son Charles, a banker and East India Company official in Canton. Charles returned to Scotland during the campaign and outpolled Maitland at the 1832 general election.
