This paragraph applies to ship, passenger and merchandise dues chargeable by the Docks Board and the Railways Board, at the following harbours—

The said dues shall not exceed the charges in operation at the harbour in question on the first day of September, nineteen hundred and fifty-seven, increased by twenty-five per cent.

Where any merchandise shipped or unshipped into or from a ship entering, using or leaving the harbour is not described in any list or classification of merchandise by reference to which the charges in operation at that harbour on the first day of September, nineteen hundred and fifty-seven, were calculated, the maximum dues chargeable in respect thereof shall be the maximum dues chargeable in the case of whatever merchandise described in the said list or classification most nearly resembles it in its nature, packing and quality.