Nothing in this Act contained shall authorize any person to purchase, take, use, or interfere with any lands, soil, or water, or any right in respect thereof, belonging to Her Majesty, in right of the Duchy of Lancaster, without the previous consent in writing of the Chancellor of the said Duchy of Lancaster, which consent such Chancellor is hereby authorized to give, or to take away, lessen, prejudice, or alter any of the rights, privileges, powers, or authorities vested in or enjoyed by Her Majesty, in right of the said Duchy of Lancaster.