Final answer:
Bevan resigned from the Cabinet in 1951 over NHS prescription charges and Britain's involvement in the Korean War.
Step-by-step explanation:
Aneurin Bevan, a Welsh Labour Party politician, resigned from the Cabinet in 1951 due to disputes over the introduction of NHS prescription charges as well as Britain's involvement in the Korean War. This occurred during a post-WWII period when the British Labour government, trying to manage finances while maintaining social services, made the controversial decision to implement charges for NHS prescriptions which went against the original principle of a free National Health Service. Bevan, having been one of the main architects of the NHS, saw this as contrary to its founding ideals and thus resigned in protest. Additionally, Bevan's opposition to British military actions, such as those in the Korean War, contributed to his decision to resign.