Records of Prime Ministers of the United Kingdom the middle name until the 1980s.) The richest Prime Minister was Lord Derby, with a personal fortune of over £7 million (about £444 million in today's money). The poorest was William Pitt the Younger, who was £40,000 (now over £1 million) in debt by 1800. Three Prime Ministers ultimately died as a result of accidents: Records of Prime Ministers of the United Kingdom The article lists the records of Prime Ministers of Great Britain and of the United Kingdom since 1721. The Prime Minister with the longest single term was Sir Robert Walpole, lasting 20 years and 315 days from
September 1966 Commonwealth Prime Ministers' Conference September 1966 Commonwealth Prime Ministers' Conference The September 1966 Commonwealth Prime Ministers' Conference was the sixteenth Meeting of the Heads of Government of the Commonwealth of Nations. It was held in the United Kingdom and was hosted by that country's Prime Minister, Harold Wilson. The conference was dominated by the rebellion of the British colony of Rhodesia which was under the white minority rule regime of Ian Smith. Facing the possible collapse of the Commonwealth, with African states threatening to leave the association if action wasn't taken against Rhodesia, Britain agreed to a policy of No independence before majority rule