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Henley was elected to the Legislative Assembly in 1904 representing Burwood as a member of the Liberal Reform Party, Liberal Party, Nationalist Party and United Australia Party until 1935, except for the period of proportional representation (1920–1927), when he was a member for Ryde.
However, the party did elect one member, William Hedges, as the member for Fremantle; he remained officially a member of the WAP, although he sat as an independent and, like Forrest, joined the Commonwealth Liberal Party when it formed.