Penelope Wilton and Rachel Joyce The Unlikely Pilgrimage of Harold Fry - from page to screen

The film adaptation of Rachel Joyce's smash hit best-selling novel releases at the end of April. This charming story centres on Harold, an ordinary man who has passed through life, living on the side lines, until he goes to post a letter one day...and just keeps walking. In a unique event, Rachel (who also wrote the screenplay) will be in conversation with the leading actress Penelope Wilton who plays Maureen and whose many screen and stage appearances include Mrs Crawley in Downton Abbey, Talking Heads, The Borrowers, and The Best Exotic Marigold Hotel. How do you take a novel from page to screen, and be true to the novelist's vision?