Fenwick was one of a group of significant correspondents on political reform, centred on the moderate reformed
Christopher Wyvill. In early 1794 he wrote to Wyvill, expressing confidence that
universal suffrage had wide popular appeal, and optimistic about the troubles the administration had with disaffection. By 1797 he was much more downbeat about democratic reforms gaining traction, given the need to avoid fomenting revolution. An invasion scare in 1798 similarly damped down hopes of reformers. In 1798 Fenwick organised the Durham Volunteer Association. It raised an infantry body. The
Peace of Amiens saw it broken up, but 1804, with the
Napoleonic Wars resumed, saw the Durham Volunteers take its place. He was lieutenant-colonel of the Volunteers, resigning in 1806, in poor health. In 1807 at a Durham County Meeting, Fenwick opposed an address to the King, after the fall of the
Ministry of All the Talents. The address was proposed by the
Earl of Strathmore, and seconded by
Matthew Russell. In return, Fenwick defended the bill (on
Catholic emancipation) that by failing had ended the ministry. Supported by
Ralph John Lambton and
Sir Ralph Milbanke, two Members of Parliament, he waved a rival address that said as much, and Milbanke seconded him. He had also the support of
Sir Thomas Liddell, 6th Baronet. The original address, however, was carried. Fenwick was a long-standing friend and political correspondent of
Charles Grey, who as Prime Minister pushed through the
Reform Bill 1832. The wait was a long one, and the Newcastle group of Fenwick,
Charles William Bigge, Thomas Headlam and
James Losh tired of Grey's tentative approach, by the 1810s. ==Local affairs, 1815–1830==