Possibly events surrounding Victory Parade in London.
Top view of parade including King George VI, Queen Elizabeth (later Queen Mother), Princess Margaret and Princess Elizabeth (later Queen Elizabeth II) leaving Buckingham Palace. A large crowd are gathered outside to see them.
Arrival of Winston Churchill and Clement Attlee at VIP stand. South African leader General Jan Smuts is there with other military leaders. Other VIPs arrive, including Queen Mary. The Royal Party arrive in their carriage. They meet with the gathered statesmen and officers and then go up to greet Queen Mary and (amongst others Prince Bernhard of the Netherlands).
LS of royals getting open carriage.
N.B. Item found in Unidentified Gazettes reel.