Ceremony of the keys:
You must book ahead to see this ancient ceremonial locking of the Tower's main gates, which takes place from 9.30-10pm nightly. At least two months notice should be given. Write giving your requested dates, and also alternative dates. State the number of people in your group (seven max) and enclose a self-addressed envelope with either first class UK postage or two IRCs. Quote name, date required & alternatives, number of people and enclose a SAE. Write to: Ceremony of the Keys, Waterloo Block, Tower of London, London EC3N 4AB, England.