Kammala jumla mai zuwa: Gwaninta na farko na wasan motsa jiki ya zo ne a gasar zakarun duniya na matasa a 1992 a matsayin wani ɓangare na tawagar 'yan wasan Burtaniya 4x400 mita da suka gama na biyar. Thomas ya halarci Makarantar Stamford da Cibiyar Harkokin Ilimi ta Yammacin London, inda ya yi nazarin Kimiyyar Wasanni da Geography. Duk da yake har yanzu a jami'a, ya shiga cikin Wasannin Commonwealth na 1994 na mita 400 inda ya kai wasan kusa da na karshe, yana wakiltar Wales. Daga can, an zaɓe shi don wakiltar Burtaniya a cikin relay a gasar cin kofin duniya.
Kofin Turai na 1995 kuma ya sami lambar zinare ta farko.