Martin, a barrister practising on the western and northern circuits who joined the Whig Club on 19 Jan. 1790, entered Parliament in 1806 as a supporter of the Grenville ministry.
Martin took his seat on 12 May and first spoke in favour of investigation of barracks, 16 May 1806. He spoke in defence of the training bill, 24 June, and in July was a critic of the East India Company, of which he had formerly been a stockholder. His first major intervention was a motion to deprive Perceval of the revenue of the duchy of Lancaster, 25 Mar. 1807, at the outset of the Portland ministry: he disclaimed party grounds and succeeded by 208 votes to 115. Subsequently the main theme of his speeches was the reduction of public expenditure with reference to sinecures, pensions and other superfluities. He was tenacious in pursuit of economical reform, but moderate in his approach. Thus on 2 July 1807 he advertised Lord Cochrane’s imminent motion on the subject, but he did not vote for it. On 10 Mar. 1808 he secured a division on the orders in council. Thomas Grenville described him as ‘an opposition reforming lawyer who professes to be of the opposition party and not to be one of Whitbread’s followers’, 17 Apr. 1809.
Martin had challenged Perceval’s brother Lord Arden’s tenure of the sinecure of registrar of the Admiralty, 14 June 1810. On 20 Mar. 1812 he brought in a bill to ’regulate’ it. This was frustrated by 65 votes to 27, 19 June. On 19 Feb. 1813 he tried again, but was again foiled when on 21 May it was amended to preserve Lord Arden’s life interest in the office. When government carried the bill, thus mutilated, on 8 July, he opposed it, suggesting it should now be entitled ’a bill to postpone all regulation of the office of registrar of the Admiralty till after the death of George Lord Arden’.
Outside his chosen field, Martin seldom had much to say. In February 1809 he cross-examined witnesses as to the Duke of York’s conduct. He criticized the Scheldt expedition, 26 Jan. 1810, the Regency proposals, 1 Jan. 1811, the frame-breaking bill (as a Nottingham magistrate), 14 Feb. 1812, and raised questions about the Princess Charlotte’s establishment in November and December 1814, which she thought were of service to her. This move was perhaps suggested by his connexion with Brougham, for whom Martin was scouting around for a seat in Parliament.
Martin retired in 1818 and became a master in Chancery when his friends returned to power. He carried the reform bill from the Lords to the Commons on its passage in 1832, which Creevey thought a piquant assignment for the descendant of the regicide Harry Martin.
