The second of this series's Knockout shows sees 12 more acts sing for a place in the live semi-finals. Coaches Jennifer Hudson, will.i.am, Sir Tom Jones and Olly Murs can pick only one act from their teams to progress in the competition, so there are some tough decisions to make. Helping the coaches make those decisions are very special guests Craig David, members of The Black Eyed Peas, Kylie Minogue, Leona Lewis, and The Voice UK's reigning champion Mo Jamil. Who will go through?