Where there is given to the tenant of an agricultural holding a notice to quit part of the holding, being either—
such a notice as is rendered valid by section 31 above, or
a notice given by a person entitled to a severed part of the reversionary estate in the holding,
subsection (2) below shall apply.
If—
within twenty-eight days after the giving of the notice, or
where the operation of the notice depends on any proceedings under this Part of this Act, within twenty-eight days after the time at which it is determined that the notice has effect,
the tenant gives to the landlord or (as the case may be) to the persons severally entitled to the severed parts of the reversion a counter-notice in writing to the effect that he accepts the notice to quit as a notice to quit the entire holding given by the landlord or (as the case may be) those persons, to take effect at the same time as the original notice, the notice to quit shall have effect accordingly.