Columbia subject headings:
Political parties--Great Britain--History--19th century.
Political parties--Great Britain--History--20th century.
Harvard subject headings:
Great Britain--Politics and government--19th century.
Great Britain--Politics and government--20th century.
Political parties--Great Britain--History--19th century.
Political parties--Great Britain--History--20th century.
Princeton subject headings:
Political parties--Great Britain--History--19th century.
Political parties--Great Britain--History--20th century.