Ludwig
9pm, BBC One
An amusing comedy drama from Mark Brotherhood (Mount Pleasant, Benidorm) about a reclusive and socially inept puzzle-setter, John “Ludwig” Taylor (David Mitchell, doing his familiar young fogey thing). John is called on to impersonate his identical twin brother, a detective named James, after he goes missing. When James’s wife, Lucy (Anna Maxwell Martin), asks John to pick up some documents from James’s station, the inevitable happens: John finds himself investigating a murder. Phil Harrison
