Thomson graduated to Parliamentary politics at the end of the First World War. At the
1918 general election, the still serving Sergeant Thomson stood for election in
Middlesbrough West. There is disagreement as to his party affiliation. In
The Times House of Commons, 1919 he was described as a Coalition Liberal although it seems unlikely that he received the
government coupon. He certainly had no
Conservative opponent but he may have identified with the coalition because it had successfully prosecuted the war in which he had just served. In other sources he is described simply as a Liberal. He defeated his
Labour opponent by 10,958 votes to 5,350 – a majority of 5,608. At the
1922 general election Thomson faced a
National Liberal candidate, i.e. one supporting the outgoing coalition prime minister
David Lloyd George but again won comfortably by 16,811 votes to 7,422 - a majority of 9,389. At the
general election the following year Thomson again faced no Tory candidate and easily beat his Labour opponent by 16,837 votes to 7,413 – a majority of 9,424. ==The 1924 general election==