Columbia subject headings:
Great Britain--Politics and government.
Number 10 Downing Street (London, England)
Prime ministers--Great Britain.
Harvard subject headings:
Executive power--Great Britain--History--20th century.
Great Britain--Politics and government--20th century.
Number 10 Downing Street (London, England)
Prime ministers--Great Britain--History--20th century.
Princeton subject headings:
Great Britain--Politics and government--20th century.
Number 10 Downing Street (London, England)
Prime ministers--Great Britain--History--20th century.