The New Elizabethans. Margaret Thatcher, politician.

James Naughtie considers the lasting influence of Margaret Thatcher, the longest serving Prime Minister of the 20th Century and the only woman to hold the post. Her uncompromising policies and leadership style earned her the enduring nickname "The Iron Lady".

Among her initiatives were the deregulation of the financial sector, the privatisation of state-owned companies, and the reduction of the power and influence of trade unions, policies that have become known as "Thatcherism".

The New Elizabethans have been chosen by a panel of leading historians, chaired by Lord (Tony) Hall, Chief Executive of London's Royal Opera House. The panellists were Dominic Sandbrook, Bamber Gascoigne, Sally Alexander, Jonathan Agar, Maria Misra and Sir Max Hastings.

They were asked to choose: "Men and women whose actions during the reign of Elizabeth II have had a significant impact on lives in these islands and/or given the age its character, for better or worse.".