Hello, Craig. This was a very interesting ceremony to attend. The playing of the Last Post at the end was quite moving, as well. The other visitors, we learned on our tour, are guests of the members of a club/bar for the Yeoman Warders, police and military (perhaps), who come down from the club to observe the ceremony. The evening we were there, there were only about 40 people (aside from the people who booked online.) Also, the ticket calendar is booked well into 2019 -- 2020 ... so if you can make friends with a police officer or a member of the military who are club members, you'll be part of that special group who comes in separately, and can get a ticket.