At the Northern Ireland general election, 1945, Downey was elected for Belfast Dock, defeating sitting Ulster Unionist Party member George Anthony Clark. Downey lost the seat at the 1949 general election.
- Dennis Cooke, Persecuting Zeal
- Graham S. Walker, The Politics of Frustration
- Biographies of Members of the Northern Ireland House of Commons
|Parliament of Northern Ireland|
George Anthony Clark
|Member of Parliament for Belfast Dock
Thomas Loftus Cole