In 1946 Casey returned to Australia in the hope of being elected to parliament in the 1946 election and becoming the leader of the new Liberal Party that Menzies had formed in 1944, as part of his reorganisation of conservative politics in Australia.
In January 1960 Casey was made a life peer of the British House of Lords, on the recommendation of the British Prime Minister, Harold Macmillan;[REF] next month he resigned from the ministry and parliament.