Before joining the regular cast, Walkinshaw made three guest appearances in The Bill in 1992, 1993 and 1995. Four years later, while he was acting in a stage production at the Royal Court Theatre, one of The Bill'''s producers asked Walkinshaw to audition for the role of PC Dale "Smithy" Smith.
Before becoming part of the regular cast, Walkinshaw appeared as a guest in The Bill in 1992, 1993, and 1995. Four years later, while performing in a stage production at the Royal Court Theatre, one of The Bill's producers invited Walkinshaw to audition for the role of PC Dale "Smithy" Smith.