I heard that it was hard to book Warner Bros. Studio in official website, luckily I found that I was able to book in Klook. I was impressed by the details mentioned before I made payment, it saved a lot of my time to source out where else can I book from. The location of gather point was in central London, Victoria station, which is quite easy to find the tourist information shop and got into the Harry Potter bus, they provided with HP movies and free WiFi for guests, they came on time, so that we would not missed out the time for visit and plenty of time for you to go for washroom and shops. I feel so amazed during this tour and felt happy for the whole journey. The butter beer is a must try in there!