Channel 5 has just celebrated its 21st birthday – it’s hard to believe but the channel launched on Easter Sunday in 1997, joining BBC One, BBC Two, ITV, and Channel 4 on our TV screens. Now of course we are spoiled for choice, with 70 channels available to watch on Freeview, including 15 HD channels and more than 30 radio stations! To celebrate, Freeview is giving you the chance to win from a selection of boxsets of some of the most popular shows to screen on Channel 5, 5 STAR and 5 USA. If you enter the prize draw you could win boxsets of hit shows Castle, Person of Interest, The Magicians, The X-Files or NCIS Los Angeles. All you need to do is answer the question below correctly for a chance to win!