The Commissioners for the time being of Her Majesty's Works and Public Buildings, as incorporated by and for the purposes of the Act of the fourteenth and fifteenth years of Her Majesty, chapter forty-two, are hereby declared to be, and shall be a Corporation to all intents and purposes, and as such shall have and hold, and may exercise not only all the Estates, property, interests, privileges, and powers now vested in or enjoyed by them under that Act, but also all estates, property, interests, privileges, and powers now vested in or held or enjoyed by the Commissioners of Her Majesty's "Works and Public Buildings as a Corporation under the Act of the fifteenth and sixteenth years of Her Majesty, chapter twenty-eight, or any subsequent Act, and in or by the Battersea Park Commissioners.