I'm a university professor who takes Theatre tours of students to London during the summer.
London, United Kingdom
Our group of 7 thoroughly enjoyed the Harry Potter Walk in London. The pace was very brisk, so anyone going on it in the future will need to "keep up the pace" to stay with the tour guide. I particularly enjoyed parts of the city that a normal "tour bus" would not enter or reveal. The price was reasonable and the experience appreciated by all of our group.