Emilia Fox has shared what she believes is the secret to the long-running success of Silent Witness on the BBC.

The crime-drama returned for its 28th series last night (Monday, January 6) and follows a team of forensic scientists investigating various crimes.

Fox has starred as Dr Nikki Alexander on the show for 21 years now and appeared on Good Morning Britain today (Tuesday, January 7) with David Caves, who plays Jack Hodgson.

Presenter Susanna Reid asked her what she believed was the secret behind the continued longevity of the show.

📢 Silent Witness returns from Monday 6 January on @BBCiPlayer and

© South Wales Argus