[1] Thomas competes in the S14 classification for swimmers with intellectual disabilities, mainly freestyle and backstroke, preferring shorter distances.

In 2014 he competed at the Commonwealth Games in Glasgow representing Wales and took the bronze medal in the 200m freestyle S14.

[2] Thomas first began swimming at the age of four, when his parents took him to the local pool in an attempt to help him burn off excess energy.

[2] His parents petitioned the Equality and Human Rights Commission, the director of which stated in 2008 that the Thomas' letter was a major factor in seeing the Youth Sports Trust lift the ban for children competing in Britain.

[4] A month later he was back in the Great Britain team, this time travelling to Eindhoven to take part in the 2014 IPC Swimming European Championships.