Sarah Phelps 1 credits

Sarah Phelps is a British television screenwriter, radio writer, playwright and television producer. She is best known for her work on EastEnders, a number of BBC serial adaptations including Agatha Christie's The Witness for the Prosecution, And Then There Were None, Ordeal by Innocence, The ABC Murders and The Pale Horse; Charles Dickens's Great Expectations and Oliver Twist; and J. K. Rowling's The Casual Vacancy, as well as work with the Royal Shakespeare Company.

Source: Wikipedia, CC BY-SA 4.0.