Hi what was the name of the tour company you used for this event?
London walking tours or fun London tours
Both are great
I didn't use any tour company or guide, made my own way down to the palace and waited
I didn't use a tour guide either time I went. Don't even know if there is one. Just show up outside Buckingham Palace and wait. Go early. At least an hour. An hour and a half would be worth it if you want front row views.
Get quick answers from Changing of the Guard staff and past visitors.