Yes - the Freemen of the Worshipful Companies of Vintners and Dyers in the City of LondonThe upping is most important
http://www.royalswan.co.uk/
have a right to eat swans from the Thames bearing their marks, hence the biennial swan-upping,
when the Queen's swans and those livery guild swans are checked and marked
(but these days not eaten, it's a useful check on the conservation status of the birds)
Everywhere else in England, all swans belong to the Queen,
but the Fellows of St John's have leave to eat ones from the Cam
(but I don't think they do any more)