I think the Queen can delegate it to whoever she wants (as the investiture is just a formality), but Charles and Anne are the only two other royal family members I've seen doing it. Ambassadors and high commissioners do them if someone overseas is awarded and can't make it to London, also. (Governors-general handle it most of the time when something is awarded on the advice of a non-UK government, but once in a video of an investiture at Buckingham Palace I saw the insignia of the Order of Australia in the box.)
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