Tickets are now available (first time is on 10 August) to see the Tower of London Opening Ceremony each day (the counterpart of the Ceremony of the Keys at night).
Entrance is at 0830 for 0845, it isn't cheap at £62, but includes skip the line first admission to the Tower and first in to see the Crown Jewels- https://www.hrp.org.uk/tower-of-london/whats-on/tower-of-london-opening-ceremony-experience/