In 1780 Grigby contested Ipswich, but was heavily defeated, and ‘disclaimed all future attempts to represent the borough’.
Three speeches by Grigby are reported.
Grigby did not stand in 1790. He died 26 Dec. 1798, aged 67. The Gentleman’s Magazine (1829, p. 374) described him as ‘a zealous advocate for civil and religious liberty’.
