For the removal of doubt it is hereby declared that any power conferred—
under this Act, or
by or under the Acquisition of Land (Authorisation Procedure) Act 1946, or any enactment passed before the commencement of that Act,
to purchase land compulsorily is, except in so far as any express provision of any such enactment restricts the exercise of the power, exercisable notwithstanding any other enactment providing that the land shall be inalienable.