He won the seat at a by-election in March 1936, when his predecessor resigned to become Governor of Burma. A solicitor by training, Cassells held the seat until his appointment in 1941 as a Sheriff-substitute of Inverness, Elgin and Nairn, when he was succeeded at a by-election by Adam McKinlay. He also served as Dean of Guild for the Burgh for Falkirk.
Thomas Cassells was educated at Hamilton Academy where one of his teachers had been Robert Gibson, himself a former pupil of the school, and who was also to serve as a Labour MP (for Greenock) and over the same period, 1936-41. From the Academy, Cassells studied at both Glasgow and Edinburgh universities. He was McFarlane Scholar in Law at Glasgow.
- article mentions his by-election win
- Leigh Rayment's Historical List of MPs – Constituencies beginning with "D" (part 4)
- Who Was Who, 1941-50. A. & C. Black, 1967
- Hansard, parliamentary debate, 16 Dec. 1936 Thomas Cassels and Robert Gibson, reference to Hamilton Academy. Retrieved 2011-01-11
- Hansard 1803–2005: contributions in Parliament by Thomas Cassells
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