下議院領袖
In 1968, Peart became Lord Privy Seal, with no particular responsibilities. Seven months later, Peart became Leader of the House of Commons, taking the subsidiary title Lord President of the Council. After Labour lost the 1970 election, Peart returned to opposition as Shadow Leader of the House of Commons. He held that position until December 1971, when he became Shadow Agriculture Minister. When Labour returned to power, Peart once more took the Agriculture portfolio.