Section 62(2) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(2)In the event of an Ambassador or High Commissioner, or such other officer, being detached on a foreign mission in his official capacity as Ambassador or High Commissioner, special instructions, shall be issued in each case as to the flag which should be hoisted in a man-of-war in which he may be embarked; in the absence of instructions from the senior authority, the Senior Officer present shall exercise his discretion in consultation with the official about to embark.
