This was the highlight of my trip, and I can't stress enough how impressive the Warner Bros. Studio Tour is for fans and non-fans alike. The tickets are pretty pricey (around $65 for an adult ticket with souvenir and digital headset guide), but so worth it. I'd recommend buying your tickets online ahead of time to make sure you get the day and time you want and to avoid lines. And give yourself several hours to enjoy it — we were there close to five hours and I could have stayed all day because there's so much to see.
One other pro tip: it's quite a distance outside of the city and requires a train and shuttle bus (that picks up at the station), so if you're staying in London, give yourself at least two hours to get out there unless you've rented a car.
