Eggsalent Piece of Work

It appears that environmental legislation has inadvertently made it an offence for even bona-fide museums to have egg shells from wild UK birds that were collected between 1954 and 1981 (http://www.guardian.co.uk/law/2011/dec/26/lawyers-crack-case-unlawful-eggs). This seems to have been a drafting glitch that has been seized upon by collectors. Changes are needed as it is difficult to defend retrospective alternations to the law.