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I was able to locate information provided on the website listing information from the official royal historic site:
These special commemorative firings take place on the Gun Park located on the Wharf. You do not need a Tower ticket to watch them as they can be viewed on Tower Hill, however closer views will be available inside the Tower for ticket holders.
Please note the Wharf will close at least an hour before the gun salutes and there will be no access to the parts of the Wharf during the set up and duration of the gun salutes.
There may be more salutes but are dependent on whether state visits are planned.
Gun salutes take place at 13.00 and are 62 rounds unless otherwise stated.
Friday 6 February - Accession of Her Majesty Queen Elizabeth II to the throne
- See more at: http://www.hrp.org.uk/TowerOfLondon/VisitUs/Closures-notices#sthash.40HbWW7e.dpuf