Adjoa Andoh (born 14 January 1963) is a British film, television, stage and radio actress. She is known on the UK stage for lead roles at the RSC, the National Theatre, the Royal Court Theatre and the Almeida Theatre. She is also a familiar face on British television, notably in two series of Doctor Who as companion Martha's mother Francine Jones; 90 episodes of the BBC's long-running medical drama Casualty as Staff Nurse (later Sister) Colette Griffiths (née Kierney); and a year in the BBC's EastEnders. Andoh is the voice of the audio book version of Alexander McCall Smith's “How to Raise an Elephant” released in 2020, from the series of No. 1 Ladies Detective Agency novels.