In an extended edition of The World at One, we look back at the life of the former Prime Minister Margaret Thatcher, whose death was announced today.
Lord Bell, who worked closely with her when she was leader of the Conservative party and who released news of her death pays tribute.
The former Deputy Leader of the Labour Party - Lord Hattersley - gives his assessment of her career.
Biographer Charles Moore describes her life and legacy.
Lord Tebbit and Lord Armstrong describe what she was like to work with.