The civil service comprises all government departments and executive agencies in Great Britain and includes diplomatic service. In the past the civil service was one of the largest work forces in Britain however due to privatisation and outsourcing the numbers have declined. This indicates that the influence of the civil service has declined in recent years. Whereas the prime ministers powers have always been sustained and only lost under weak premierships. Powers mainly enforced by the royal prerogative makes the Prime minister the single highest and most powerful decision maker in the political system.