Ten years ago Harry Potter and the Philosopher’s Stone hit the big screen and, since then, the films have been part of the Harry Potter phenomenon and watched by billions of viewers around the world. As the final film, Harry Potter and the Deathly Hallows Part Two, hits cinemas Ben Shephard gets exclusive behind the scenes access to find out what happens on set, an insight into the sheer scale of the production effort and creative work involved in bringing to life JK Rowling's books, and how the film’s stars feel about the end of an era. Shephard finds out about the production team's use of CGI to portray Hogwarts, how 2,000 wands were needed in the film's epic battle, and that the Great Hall had to be destroyed and rebuilt three times during filming. Daniel Radcliffe reveals how he wants to keep Harry's glasses, and he, Emma Watson and Rupert Grint share their feelings on the end of an era. With contributions by Helena Bonham Carter, Tom Felton and Julie Walters.