Weir Gilmour was born in Lanarkshire. He started out working as a miner. He was at one time a mining surveyor, based at Annathill, and in 1920 was elected to the Institution of Mining Engineers. Around 1931 he worked as a salesman.
Gilmour's first public candidature came at the 1931 General Election. He had joined the New Party, recently founded by Labour Party rebel Oswald Mosley. He fought the Lanarkshire seat of Coatbridge without success.
In 1933 Gilmour co-founded the Scottish Democratic Fascist Party with Major Hume Sleigh. The party sought to prohibit Irish migration to Scotland, expel Catholic religious orders from Scotland, and repeal the Education Act 1918. No Catholics were permitted to join the SDFP. The SDFP was at odds with Oswald Mosley's larger British Union of Fascists, particularly over the issue of Catholicism. In contrast to the SDFP, the BUF was accepting of Catholics, with Catholics making up a high percentage of the BUF membership, particularly in Northern England. This led to Weir Gilmour denouncing the BUF as "run by Roman Catholics, organised by Roman Catholics, in the interests of Roman Catholics." Gilmour later opined that the SDFP's virulent anti-Catholicism may have unintentionally undermined fascism in Scotland by putting off prospective Catholic recruits. In 1937 he was elected to PeeblesTown Council, for which he remained a member for more than 20 years.
Labour Party
In the 1945 General Election he was organizer for the Labour and Co-operative Party candidates in Dumfriesshire. He was a frequent speaker on Labour platforms during the election and acted as Election Agent for the Labour candidate at Dumfriesshire.
Liberal Party
Prior to the 1950 General Election, he gravitated to the Liberal Party. Following boundary changes a new constituency of Midlothian and Peebles was created. He somehow managed to get himself chosen as the Liberal candidate to contest the election. The local liberal associations were still organised on the old boundaries and the Peebles and Southern Midlothian association, which covered much of the new seat, publicly stated that they had never been consulted on the adoption of Gilmour as Liberal candidate. The Chairman of the association and at least one other committee member resigned in protest at his selection. The association secretary said "Councillor Gilmour was not adopted by the Association and we are making no recommendation to Liberals as to how they should vote." In a poor election for the Liberals generally, Gilmour finished third, losing his deposit. He did not stand for parliament again.
Later life
In 1957, he attracted national publicity when he criticised 'obscene language' on the BBC. In 1979 he published a book on Famous Scots.
