A native of county Durham, Fenwick was the eldest son of Thomas Fenwick, a financier who was a partner in the banking house of Lambton and Co. Called to the bar in 1842, he practised on the Northern circuit, before retiring in 1851 to seek public office. After being defeated at the 1852 general election in Sunderland and the 1852 by-election in Durham City, he offered again for the former at the 1855 by-election, where William Digby Seymour was defending his seat following his appointment as recorder at Newcastle-upon-Tyne. Standing in the Liberal interest, Fenwick attacked Seymour for ‘betraying’ his duty to Sunderland, and after a bitter contest, topped the poll.
A steady attender,
In 1861 Fenwick served on the select committee on the salmon and trout fisheries bill, where he generally divided in the majority, and became an ardent supporter of fishery reform thereafter.
Fenwick’s voting record reflected his support for religious liberties and electoral reform. He consistently divided for church rate abolition and for the Maynooth grant, and labelled the government’s Durham University bill ‘a sham’, as the institution would remain under the control of the Bishop of Durham, 18 July and 22 July 1861. A supporter of the secret ballot, he was in minorities for Locke King’s county franchise bill, 11 Mar. 1861, and Edward Baines’s borough franchise bill, 11 May 1864. Although he had voted against Palmerston’s conspiracy to murder bill, 18 Feb. 1858, he consistently backed the premier during his second ministry, and his loyalty was rewarded after the 1865 general election when he was appointed a lord of the admiralty. Fenwick duly sought re-election, but after a fractious contest where illness prevented him from appearing in person, he was defeated by his Liberal challenger.
Following his defeat, one sympathetic commentator insisted that Fenwick had been ‘a very industrious and intelligent member of the House of Commons’.
