Boots are being polished and buttons are being buffed ahead of today's annual inspection of the Woolwich-based Kings Troop Royal Horse Artillery (KTRHA).
The unit is responsible for firing royal and ceremonial salutes, and took centre stage at the funeral of Baroness Thatcher, bearing her coffin from St Clement Danes to St Pauls Cathedral.
More top news
Charlie's parents asked European court judges in Strasbourg to consider their claims but they refused to intervene.
Rachid Redouane, 30, gave the Immigration Service the false alias Rachid Elkhdar, a court heard, and said he was five years younger.
Judges in the European Court of Human Rights have rejected a plea from the parents of terminally-ill baby Charlie Gard to intervene.