He was the Member of Parliament (MP) for Gainsborough from a 1956 by-election until 1983. While representing this constituency, he wrote to Prime Minister Margaret Thatcher, after Argentina's invasion of the Falkland Islands, that he felt the British government should "let the Argentinians have the Falklands with as little fuss as possible". This letter, apparently written without the knowledge of his constituency party, remained secret until revealed by the release of part of the Thatcher archive in 2013.