In any case where a superior landlord served with a copy of a tenant's request under regulation 12(5) or with an intended counter proposal under regulation 12(1)(b)(ii), has also been served with an improvement notice in relation to the domestic PR property, or the building of which it forms part, the superior landlord must, as soon as reasonably practicable after the date of service of the tenant's request or the intended counter proposal (as the case may be)—
In any case where a landlord served with a tenant's request has been served with an improvement notice, or the superior landlord has complied with paragraph (1), the landlord must as soon as reasonably practicable—
Where a tenant is served with a copy of an improvement notice in accordance with paragraph (2) at any time before the landlord's full response is served, the tenant's request ceases to have effect.