The "Iron Lady," known for her strong leadership as a UK Prime Minister, is Margaret Thatcher. Serving from 1979 to 1990, she was characterized by her firm stance on economic policies and foreign affairs. Thatcher championed free market principles and implemented sweeping reforms, leading to significant economic changes in the UK. Her unwavering principles and decisive governance earned her the nickname "Iron Lady," reflecting her resolve and dedication to her political beliefs, including a strong opposition to communism during the Cold War.