Nothing in this or the special Act, or any Act incorporated therewith contained shall extend to alienate, defeat, vary, lessen, abrogate, or prejudice any estate, right, title, interest, prerogative, royalty, jurisdiction, or authority, of or appertaining to the Queen’s most excellent Majesty, nor to abridge, vary, or abrogate any of the powers or authorities by law vested in the Admiralty, or in the Commissioners of Her Majesty’s F1Customs and Excise, or in the F2Crown Estate Commissioners, in relation to the possessions and land revenues of her Majesty in right of her crown, or otherwise howsoever.