Mason began her acting career in 1994, and her first credited role was as Laurie Henderson in the CITV children's television series Three Seven Eleven, and later that year appeared in the television film The Whipping Boy. In 1995, she played a receptionist in an episode of in the crime drama She's Out, before joining the cast of the ITV police procedural television series The Bill as W.P.C.
Mason started her acting career in 1994 with a role as Laurie Henderson in CITV's Three Seven Eleven. That same year, she appeared in The Whipping Boy. In 1995, she played a receptionist in She's Out and joined the cast of The Bill as W.P.C., an ITV police procedural.