TV dramatist Jed Mercurio, producer Caryn Mandabach and writer-director, Dominic Savage talk to Anne McElvoy about creating successful dramas including The Line of Duty and Peaky Blinders. Novelist Sarah Waters discusses her play with Christopher Green called The Frozen Scream and latest novel The Paying Guests. And New Generation Thinker Sarah Peverley looks at Christmas customs in Medieval England.