High Quality Content by WIKIPEDIA articles! Michael Ray Dibdin Heseltine, Baron Heseltine, CH, PC (born 21 March 1933) is a British businessman, Conservative politician and patron of the Tory Reform Group. He was a Member of Parliament from 1966 to 2001 and was a prominent figure in the governments of Margaret Thatcher and John Major. In 1990, he stood for leadership of the Conservative Party against Margaret Thatcher, and whilst he was unsuccessful, this triggered Thatcher`s eventual resignation.