One of the highlights of this year’s Christmas TV schedules is the new BBC1 adaptation of The Witness for the Prosecution (Boxing Day, 9.00pm). Before that, Drama channel is showing a day of whodunits based on Agatha Christie stories, including Margaret Rutherford as Miss Marple in Murder Most Foul (7.00pm).

There’s also A Life in Pictures (3.00pm), a docudrama about the writer featuring Olivia Williams and Mark Gatiss.