Walwyn unsuccessfully contested Herefordshire in 1776. He did not stand at the general election of 1780, though John Scudamore, his friend, thought that he could have got in at Hereford.
Walwyn voted consistently with the Opposition and remained with Fox after 1794. His only recorded intervention in debate before 1790 was a ‘short and fluent speech’ against Richmond’s fortifications plan, 27 Feb. 1786.
He died 2 Oct. 1800.
