The British monarch's movements are not publicly scheduled for security reasons, but several reliable indicators reveal when the sovereign is in residence at Buckingham Palace or elsewhere in London.
The definitive signal: when the King is at Buckingham Palace, the Royal Standard (quartered arms of England, Scotland, Ireland) flies from the palace's flagpole. When he departs, it's replaced by the Union Flag (or no flag). The Royal Standard never flies at half-mast—the Crown never dies.
The iconic ceremony (officially "Guard Mounting") typically occurs daily at 11:00 AM when the King is in residence. Check the Household Division schedule for confirmations—it's sometimes cancelled for weather or state events.
The Court Circular (published daily on royal.uk and in The Times) lists the King's public engagements days in advance. London appearances—investitures at Buckingham Palace, receptions at St. James's Palace, openings, audiences—confirm his presence.
Increased royal correspondent activity, police outriders, motorcycle escorts, and road closures around The Mall, Constitution Hill, or Clarence House often precede or accompany the King's movements. Helicopter arrivals at Buckingham Palace's lawn are occasionally visible/heard.
The King also uses Clarence House (former Queen Mother's residence, now his London base) and St. James's Palace (official court functions). No public flag protocol exists for these.
Note: The King divides time among Buckingham Palace, Windsor Castle, Sandringham (Norfolk), Balmoral (Scotland), and Highgrove (Gloucestershire). London presence is intermittent.