Simon Cowell said this was the BEST Finale performance he's EVER SEEN! | The X Factor UK

We ALL remember this cover of Bruno Mars and Mark Ronson's 'Uptown Funk'! Visit the official site: http://itv.com/xfactor SUBSCRIBE: http://bit.ly/TXFSub Facebook: http://bit.ly/TXFFB Twitter: http://bit.ly/TXFTwi