Catherine Tate's Lauren Cooper clashes with her new English teacher, Doctor Who himself, David Tennant. Subscribe ► http://bit.ly/1gXbQkj Visit Us ► http://comicrelief.com Facebook ► https://facebook.com/comicrelief Twitter ► https://twitter.com/comicrelief ------------------------------------------- Thanks for all your support - sharing the video and leaving a comment is always appreciated. Please respect each other in the comments! Donate: https://www.comicrelief.com/donate Our mission is to drive positive change through the power of entertainment. © Comic Relief 2016. Registered charity 326568 (England/Wales); SC039730 (Scotland)