Following roles in Sherlock and Doctor Who, Chan joins the regular cast of the ITV2 show’s fourth and final series as Charlotte, the arch-nemesis of Belle (Billie Piper).

“ I actually got to meet the real life dominatrix who the writers partly based the character on”, she told CultBox. “She was lovely and I also met her husband, who is her submissive. It was interesting seeing how they have a great relationship, albeit one that the majority of people would consider unconventional.”

Secret Diary Of A Call Girl is currently airing on Tuesdays at 10pm.