Margaret Thatcher, prime minister between 1979 and 1990, was and continues to be a hugely divisive figure in Britain. Her influence on British politics has long outlived her, with the Conservative Party becoming steadily more Thatcherite than it was under her leadership, especially on economic issues. Policies that support privatization, curbs on trade unions and employment rights (to promote further labour market flexibility), reduction in welfare provision, the replacement of collectivism with individualism, and the marketization of public services, including the NHS and education, are all Thatcherism in practice, and still continue today.

Peter Dorey offers a lively analysis of how Thatcherism became an ideology for politics to conjure with, its relationship with its eponymous leader and with the Conservative Party, as well as the long-term implications for the British people. He argues that the radical modernization of Britain that started under Thatcher's leadership in the 1980s has created the conditions that have led to the polarization of British society today; a process that was profoundly unconservative in its values and approach, destabilizing institutions which Conservatives once deemed sacrosanct, and replacing continuity and solidity with constant change and competition.