[3] Thomas began his television career in 2002 with a guest appearance on the BBC daytime soap opera Doctors.

It was another four years before Thomas launched to fame in his breakthrough role as Donte Charles in the BBC One school-based drama series Waterloo Road of which he was an original cast member upon its inception in 2006 until 2009.

He also appeared as himself on ITV gameshow All Star Family Fortunes alongside his older brother and fellow actor Ryan, who played Jason Grimshaw in the soap opera, Coronation Street.

Following his departure from Waterloo Road in 2009,[4] Thomas signed on for his third appearance on daytime soap Doctors, this time playing a character called Ben Hamilton.

[5] It was announced on 21 May 2009 that Thomas had landed the role of Adam Barton in the long-running ITV soap opera, Emmerdale, and would appear on screens from July 2009.

Thomas's historic and publicly documented alcoholism led to him resigning as director of the limited company as early as mid-2022.

[14] In August 2020, Thomas admitted that he and his twin have a drinking problem; he vowed to get sober like his brother who celebrated six months of sobriety at the time.