 Returning to England in 1760, he continued to be interested in colonial affairs, publishing widely read materials on conditions in the colonies, including several editions of The Administration of the Colonies. As a Member of Parliament he regularly advocated for colonial positions without much success, but supported the war effort once the Revolutionary War began. In the early 19th century he became an early advocate of the reduction or removal of trade barriers, and the establishment of a solid relationship between Britain and the United States. Several writers have proposed that Pownall was Junius, a pseudonymous writer of letters critical of British governmental practices.
