Section 31(2) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(2)For the purpose of this Regulation, as a rank of full Admiral does not exist in the French Navy, a Vice-Admiral of that nation, who is also Chief of Naval Staff or Inspector-General of the Navy (who will fly a square flag of the national colours with three blue stars in triangle on the white portion) shall be regarded as a full Admiral, and shall be saluted with 17 guns.
