Without prejudice to the provisions of section 86 (Crown rights) of this Act, a person licensed by the Authority under section 37 (Licensing of works) or section 38 (Licence to dredge) of this Act to carry out any work or to dredge in, upon or from any part of the bed of the port belonging to Her Majesty shall, in addition to the licence of the Authority, require the consent of the Crown Estate Commissioners on behalf of Her Majesty to carry out the work or to dredge.