Columbia subject headings:
Harvard subject headings:
Conservative Party (Great Britain)--Elections--Congresses.
Elections--Great Britain--History--21st century--Congresses.
Great Britain--Politics and government--20th century--Congresses.
Great Britain--Politics and government--21st century--Congresses.
Labour Party (Great Britain)--Elections--Congresses.
Political parties--Great Britain--History--20th century--Congresses.
Political parties--Great Britain--History--21st century--Congresses.
Two-party systems--Great Britain--History--20th century--Congresses.
Two-party systems--Great Britain--History--21st century--Congresses.
Princeton subject headings:
Great Britain--Politics and government--21st century.
Political participation--Great Britain.
Political parties--Great Britain--History.
Political party organization--Great Britain.
Political party rules--Great Britain.