All sewers within the meaning of the Public Health Act, 1875, and sewage disposal works which, by virtue of the provisions of that Act, were immediately before the commencement of this Act vested in a local authority, shall continue to be vested in them, and there shall also vest in them—
all combined drains constructed before the commencement of this Act which, by virtue of the provisions of the Public Health Act, 1875, would immediately before the commencement of this Act have been vested in the local authority as sewers but for the provisions of some enactment or statutory scheme relating to the construction of combined drains, or of an order made under such an enactment or scheme;
all sewers and sewage disposal works constructed by them at their expense, or acquired by them;
all sewers constructed under any enactment relating to the sewering of private streets to the satisfaction of the council carrying that enactment into execution, except any such sewer which by virtue of section twenty-nine of the Local Government Act, 1929, will vest in the county council; and
all sewers and sewage disposal works with respect to which a declaration of vesting made under the foregoing provisions of this Part of this Act has taken effect.