Subject to section 26 below, the authorised undertaker is hereby authorised to acquire compulsorily—
(a)such of the land shown on the Parliamentary plans within the limits of deviation for the authorised works as—
(i)is described in the book of reference; and
(ii)may be required by the authorised undertaker for the purposes of the authorised works; and
(b)such of the land so shown within the limits of land to be acquired or used and so described as—
(i)is specified in columns (1), (2) and (3) of Part 1 of schedule 7 to this Act; and
(ii)may be required for the purposes specified in relation to that land in column (4) of that Part.