Editorial use only Mandatory Credit: Photo by ITV/Shutterstock (10740713g) Miss Marple, as played by Geraldine McEwan. 'Britain's Favourite Detective on ITV' TV Show, UK - Aug 2020 Britain's Favourite Detective on ITV, is a British ITV one-off special celebrating the greatest on-screen sleuths from the past 50 years. Narrated by award-winning actress, Sheridan Smith, the special counts down the nation's most-loved investigators, with the likes of Columbo, Inspector Morse, Hercule Poirot and the Midsomer Murders gang competing for the number one spot, as voted by the great British public. Trawling through the crime files, with nostalgic archive clips from iconic shows, it's set to be 'the biggest whodunnit of them all'.