Castle On The Hill Ed Sheeran
As the second single from their Progress album, it features Mark and Gary on lead vocals.
It has been reported that the boys planned to premiere the song on X-Factor 2010's finals night.
However, due to its props and staging resembling a riot Simon Cowell advised them to perform 'The Flood', due student riots happening in London at the time.
The music video was filmed in Bulgaria where the band act as conquering heroes from different eras of war.