Later credits include the recurring role of River Song in the BBC science fiction series Doctor Who (2008–2015), Mrs.
Bennet in the ITV1 period-drama fantasy Lost in Austen (2008) and Dinah Drake Lance in The CW's Superhero fiction drama series Arrow (2013–2016).
Her sisters are Susie, who is mentally and physically disabled as a result of being deprived of oxygen at birth, and Nicola, a former actress who appeared in the 1996 British TV production of The Fortunes and Misfortunes of Moll Flanders, in which Kingston starred.
Kingston was inspired to pursue acting by one of her teachers at Rosebery School for Girls.
In 2008, Kingston guest-starred in the fourth series of the long-running science fiction television programme Doctor Who in the two-part story "Silence in the Library"/"Forest of the Dead" as River Song.