The Cenotaph in London typically features six flags arranged with three on each long side. The three flags on one side are the Royal Air Force Ensign, the Union Flag, and the Red Ensign; the three on the opposite side are the Blue Ensign, the Union Flag, and the White Ensign. These flags symbolize the armed forces and government services connected to the nation’s war dead. Details and context

• Flag meanings:
  • Union Flag: the United Kingdom.
  • White Ensign: Royal Navy.
  • Blue Ensign: Royal Navy Reserve, Royal Fleet Auxiliary, and certain government services.
  • Red Ensign: Merchant Navy and civilian maritime services.
• Design origin: Sir Edwin Lutyens’ 1919–1920 Cenotaph design uses three flags along each flank, pairing the Union Flag with service ensigns to acknowledge both military and civilian contributions (e.g., Navy, Army, RAF) to the nation’s war dead.

If you’d like, I can pull up current authoritative sources or images to confirm the precise flag arrangement for a specific visit date or event.