In a first for Who Do You Think You Are?, father-and-son comedy double-act Jack and Michael Whitehall join forces to investigate their family tree. They discover the tragedy that left Jack’s great grandfather (Michael’s grandfather) an orphan. And tracing their line back to Wales in the 1830s, they find out about a Tory ancestor's role in opposing the Chartist movement for wider voting rights.

Professor Hilary Marland features in the programme, which is now available on BBC iPlayer.