Between voyages to Bombay and China in the marine service of the East India Company, Loch served as a volunteer with the navy. He was in Lord St. Vincent’s flagship during the blockade of Brest in the summer of 1800, and later that year went on the Ferrol expedition as aide-de-camp to Sir Edward Pellew†: one of his Adam cousins deemed it ‘labour lost’, as he had nothing to do.
Loch, whose brother was at this time associated with the Huskissonites, took his seat on 1 Apr. 1830 and four days later voted for Jewish emancipation. He voted for parliamentary reform, 28 May. It is not clear whether it was he or James who divided with ministers on the grant for South American missions, 7 June. He probably voted against the abolition of the death penalty for forgery the same day. On 19 June he opposed Mackintosh’s bill to compensate sufferers by the defalcation of the registrar of Madras, disputing the validity of its premise that ‘the state is answerable for the delinquencies of its officers’. He was in minorities for amendments to the sale of beer bill, 21 June, 1 July 1830. He stood again for Hythe at the 1830 general election and survived the resident ratepayers’ attempt to open the borough. He was described by one reporter as a supporter of the Wellington ministry ‘from principle’;
Loch was named to the select committees on the East India Company, 28 June 1831, 27 Jan. 1832. He voted for the second reading of the reintroduced reform bill, 6 July 1831, but was rather less assiduous than James in his support of its details. He only paired for the passage of the bill, 21 Sept., and was not present to vote for the motion of confidence in the ministry, 10 Oct. It is uncertain whether it was he or his brother who voted with government on the Dublin election dispute, 23 Aug. He divided for the second reading of the revised reform bill, 17 Dec. 1831, and was in the majorities for its borough disfranchisement schedules, 20, 23 Jan., and third reading, 22 Mar. 1832. He voted for the address asking the king to appoint only ministers who would carry undiluted reform, 10 May. He sided with government on the Russian-Dutch loan, 26 Jan., 12, 20 July. Either he or James voted against Baring’s bill to exclude insolvent debtors from Parliament, 6 June, and in favour of public inquests, 20 June 1832. He retired from the House at the dissolution later that year.
When Marjoribanks’s brother resigned as chairman of the East India Company in protest at the new Charter Act in October 1833 Loch replaced him. He hoped to salvage some of the company’s independence and succeeded in regaining the directors’ unrestricted use of patronage.
