Subject to any provision to the contrary contained in an agreement between the appropriate agency and the person in whom an interest in the pipe is or is to be vested, every pipe which—
is a relevant pipe for the purposes of section 159 or 160 above; and
has been laid, in exercise of any power conferred by Chapter I of this Part or otherwise, by the appropriate agency,
shall vest in the appropriate agency.
Subsection (1) above is without prejudice to the vesting of anything in the appropriate agency by virtue of the exercise by the appropriate agency of any power to acquire property by agreement or compulsorily.