Where a blight notice has been served, and either—
the appropriate authority shall be deemed to be authorised to acquire compulsorily under the appropriate enactment the interest of the claimant in the hereditament, or (in the case of an agricultural unit) the interest of the claimant in so far as it subsists in the affected area, and to have served a notice to treat in respect thereof on the date mentioned in subsection (2) of this section.
The said date—
Where the appropriate authority have served a counter-notice objecting to a blight notice on the grounds mentioned in section 194(2)(c) of this Act, then if either—
the appropriate authority shall be deemed to be authorised to acquire compulsorily under the appropriate enactment the interest of the claimant in so far as it subsists in the part of the hereditament or affected area specified in the counter-notice (but not in so far as it subsists in any other part of that hereditament or area) and to have served a notice to treat in respect thereof on the date mentioned in subsection (4) of this section.
The said date—