In 1757 Vernon was returned for Weobley on the interest of Lord Weymouth, to whom he was distantly related. He did not stand at the general election of 1761. When Vernon’s father was created a peer and William Fitzherbert vacated his seat at Bramber to stand for Derby, Vernon replaced him at Bramber. He voted against the peace preliminaries in December 1762, and with the Opposition over Wilkes, 15 Nov. 1763; although absent from the divisions on general warrants in February 1764, he was classed by Newcastle, 10 May, as a ‘sure friend’. Rockingham in July 1765 and November 1766 counted him as a friend, and he voted against Chatham’s Administration on the land tax, 27 Feb. 1767.
Vernon inherited through his wife considerable property in Glamorgan, and considered standing for the county at the by-election of 1767, but was refused the Chiltern Hundreds.
He died 18 June 1813.
