Where is the location of St James Palace in whcih the Accession Council assembles upon the death of a monarch?
Accession Council: In the United Kingdom, the Accession Council is a ceremonial body which assembles in St James's Palace upon the death of a monarch (Demise of the Crown), to formally proclaim the accession of his or her successor to the throne. St James's Palace: St James's Palace is the most senior royal palace in the United Kingdom. St James's Palace:  Located in the City of Westminster, although no longer the principal residence of the monarch, it is the ceremonial meeting place of the Accession Council and the London residence of several members of the royal family.
City of Westminster