The UK Conservative Party served with the Liberals in an all-party coalition government during World War I, and the coalition continued under Liberal PM David Lloyd George (with half of the Liberals) until 1922. Then Bonar Law and Stanley Baldwin led the break-up of the coalition and the party governed until 1929, when it was defeated by Labour in a close election. In 1931, following the collapse of the Labour minority government, it entered another coalition, which was dominated by the Conservatives with some support from fractions of both the Liberals and Labour party (National Labour and Liberal Nationals).
Credit: Space Brood