Walwyn had joined the Whig Club a week before his election for Hereford. Abetted by the 11th Duke of Norfolk, he retained the seat for life. He voted against Pitt’s Russian policy on 12 Apr. 1791 and 1 Mar. 1792, and was listed a supporter of repeal of the Test Act in Scotland in April 1791. His name was queried on a list of Portland Whigs in December 1792 and, though invited, he did not attend Windham’s ‘third party’ meetings on 10 and 17 Feb. 1793. It would appear that he meant to associate with them and withdraw from the Whig Club, but ‘perhaps I may not ... immediately’, he informed Sir Gilbert Elliot on 1 Mar. 1793.
Walwyn voted steadily with the Whigs until 3 Mar. 1797 in the first session of his last Parliament and subsequently on the naval mutiny, 10 May; for parliamentary reform, 26 May; against the triple tax assessment, 14 Dec. 1797 and 4 Jan. 1798; on the plight of Ireland, 22 June 1798, and against the refusal to negotiate with Buonaparte, 3 Feb. 1800. ‘No variation in times or circumstances’, he had assured his constituents in 1796, ‘shall ever induce me to swerve one moment from those constitutional and independent principles, which have ever directed my political conduct.’
