November 27, 2004
Ceremony of the Keys Office
H.M. Tower of London
London EC3N 4AD
They only allow a limited number of people to attend each night, so you should indicate a few options for attendance in your letter. Visitors are admitted to the Tower of London under escort at exactly 9:30pm. Late arrivals are not admitted. The ceremony concludes at 10:05pm, after which all visitors are escorted to the exit. There are no photo opportunities during the ceremony, and no washroom facilities are available. This is a very historical event and should not be missed by anyone interested in British or Royal history.
From journal November in London