When should the Union flag be flown at half mast?

Downing Street Union Jack at half-mast after death of Queen Elizabeth II | AFP

The Union Jack flag at Whitehall is flown at half mast following the death of Queen Elizabeth II.

Union Jack Flags flying at Half Mast

Union Jack at Buckingham Palace at half-mast after death of Queen Elizabeth II | AFP

Flags At Half Mast Over London (1941)

users have claimed that Union Flags are flying at half-mast outside

Flying the Union Jack at half-mast

When should the flag be flown at half staff?

Union flags fly at half mast in tribute to the late Duke of Edinburgh | SWNS

Flag is flying at half-mast 21 December, 2022

Are Union Flags flying at half-mast across UK? As netizens worry for Kate and Charles

Union Jack at Buckingham Palace at half-mast after death of Queen Elizabeth II

Union Jacks fly at half staff at the British Embassy in W...

American regions that still have a Union Jack 🇬🇧

How to fly a flag at half mast

Why Do We Fly Flags Half Mast or at Half-Staff?

U.S. lawmakers honor Queen Elizabeth II, flags fly at half-staff

Half Staff Flags Explained | Flag Facts

When Do You Fly the Flag at Half Mast?