And be it enacted, That nothing herein contained shall be construed to exempt any Canal or Navigation Company who have adopted or shall adopt the Powers of the said recited Act from the Operation of any general Act regulating the Manner of charging Tolls and other Charges upon Canals or Navigations in respect of Passengers, Goods, Animals, Articles, and Things of a like Description that may be passed in the course of this or any future Session of Parliament.