Olly Murs Surprise - S4.E7

Things heat up when the arrival of Olly Murs causes a music mansion meltdown. The singers struggle to sing in Spanish when they take on a Liam Payne track. It all goes downhill for the mums when they are chased by a yeti down the UK's longest toboggan track. And one singer finally pulls ahead of the pack in the all-important seventh Sing-Off.