After the recent unintentionally parodic Danny Dyer edition of Who Do You Think You Are? it is hard to take the family tree series seriously any more. In this clip from his new sketch show Walliams & Friend, David Walliams is joined by Harry Enfield who plays the Queen in a send up of the series. It's a gag that pretty much writes itself as her majesty is repeatedly shocked to discover that her ancestors were royalty, but that doesn't stop it from being hilarious. "You're having a laugh," she says. Yes we are...

David Walliams & Friend, Fridays, 9.30pm, BBC1.