Why wasn the Queens Standard lowered to half-mast when Diana, Princess of Wales, died?
The Queen’s (or King’s) Standard is never lowered to half-staff, even upon the death of the Queen, so long as there remains someone to succeed to the throne. To do so would signify the end of the Monarchy. To express the grief of the Royal Family, Buckingham Palace hoisted the Union Jack at half-staff (though a “junior official” did commit a breach of protocol by briefly lowering the Standard to half-staff instead).