This section applies where—
a secure tenant has claimed to exercise the right to buy, but
before the landlord has made to the tenant such a grant as is required by section 138(1) in respect of the claim, a final demolition notice is served on the tenant under paragraph 13 of Schedule 5.
In such a case—
the tenant's claim ceases to be effective as from the time when the final demolition notice comes into force under that paragraph, and
section 138(1) accordingly does not apply to the landlord, in connection with the tenant's claim, at any time after the notice comes into force.
Section 138C provides a right to compensation in certain cases where this section applies.