He represented Kirkcaldy Burghs in Parliament for fifteen years, being a somewhat low-profile Member but often speaking in support of better conditions for pensioners.
The sitting Labour Member of Parliament (MP) for Kirkcaldy, Tom Kennedy, announced his resignation in January 1944.
Hubbard was selected on 22 January to fight the seat at the resulting by-election;[1] he faced opposition from Douglas Young, leader of the Scottish National Party, and a candidate standing as a 'Christian Socialist'.
[3] Hubbard only rarely intervened in debate, concentrating on issues he knew well including the Scottish mining industry.
Supporting development of the Fife coalfield, Hubbard argued that it was in "splendid isolation" because the government refused to build a Forth road bridge.