Porcher was a great-grandson of Isaac Porcher of Sainte-Sévère in Berry, a Huguenot surgeon who fled to South Carolina. He arrived in England in 1768 under the aegis of his uncle Josias Du Pré of Wilton, Buckinghamshire, governor of Madras, and himself proceeded to India to try his fortune in 1778, in which year his uncle left him £1,000 in his will.
In 1801 Porcher provided Thomas, 2nd Baron Camelford, with a bonded loan of £25,000 for six years on condition of being returned to Parliament. Camelford duly returned him for Bodmin in 1802, in which year he negotiated Lord Caledon’s purchase of the borough of Old Sarum from Camelford. In 1806, the latter being dead, his brother-in-law and executor Lord Grenville secured Porcher’s return first for Bletchingley on the Clayton interest, then early in 1807 for Dundalk on the Roden interest. He was again returned for Dundalk at the ensuing election, but also for Old Sarum on Caledon’s interest. He opted for the latter, Grenville having seen to it that ‘the amount of the late Lord Camelford’s bond ... for the principal sum of £25,000’ was assigned to Patrick Craufurd Bruce, who next occupied the Dundalk seat. Porcher had been entitled to sit for Dundalk until the end of 1808 and wished at first to transfer that seat to a friend of his. He remained his ‘bosom friend’ Caledon’s nominee until he retired in 1818.
Porcher was an inconspicuous Member. He voted against Addington’s ministry on Pitt’s naval motion, 15 Mar. 1804, but not otherwise. (He was apparently present on 23 Apr. 1804, but was not then in the minority, which he regarded as a portent of the fall of Addington.)
Porcher was on the Treasury list of supporters after the election of 1812. He voted against Catholic relief, 24 May 1813, but paired on the East India Company charter bill in June.
