20. In addition to their power to demand, take and recover ship, passenger and goods dues under section 26 of the 1964 Act and combined charges under section 27A of the 1964 Act, the Board may demand, take and recover in respect of any floating manufactured article (not being a ship within the meaning of the 1964 Act) entering, using or leaving the harbour such charges as they think fit; and the provisions of sections 30 and 31 of the 1964 Act (which require lists of charges to be available for inspection and sale and give a right of objection to ship, passenger and goods dues) shall apply to the charges authorised by this article as they apply to ship, passenger and goods dues.