London Warner Bros. Studio Tour at Tours4Fun from $80.51! Summary of The Day: The Warner Bros. Studio Tour London - The Making of Harry Potter provides an amazing new opportunity to explore the magic of the Harry Potter films - the most successful film series of all time. Enjoy previously unheard anecdotes from expert guides before going on a unique walking tour that takes you behind-the-scenes and showcases a huge array of beautiful sets, costumes and props. It also reveals some closely guarded secrets, including facts about the special effects and animatronics that made these films so hugely popular all over the world.