Arthur Greenwood (1880—1954) became deputy leader of the Labour Party under Clement Attlee, with Winston Churchill appointing him to the Cabinet as Minister without Portfolio in 1940. He was generally seen as ineffectual, though in May 1940 he emerged as Churchill's strongest and most vocal supporter in the lengthy War Cabinet debates on whether or not to accept or reject a peace offer from Germany. After that his position declined and he resigned in 1943. Until the end of World War II he performed the function of Leader of the Opposition, though he did not receive the salary.
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| width="30%" |Preceded by:
The Lord Beaverbrook
| width="40%" style="text-align: center;" |Lord Privy Seal
1945–1947
| width="30%" |Succeeded by:
The Lord Inman
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| width="30%" |Preceded by:
Vacant
| width="40%" style="text-align: center;" |Paymaster-General
1946–1947
| width="30%" |Succeeded by:
Hillary Marquand
