(1)If a request under section 48(1) (information about costs incurred) relates in whole or in part to relevant costs incurred by or on behalf of a superior landlord and the payee is not in possession of the relevant information—
(a)he shall in turn make a written request for the relevant information to the person who is his landlord (and so on if that person is not himself the superior landlord) and the superior landlord shall comply with that request within a reasonable time, and
(b)the payee shall then comply with the payer’s request, or that part of it which relates to the relevant costs incurred by or on behalf of the superior landlord, within the time allowed by section 48 or such further time, if any, as is reasonable in the circumstances.
(2)If a request made under section 48(4) (inspection of supporting accounts, receipts, etc.) relates to a summary of costs incurred by or on behalf of a superior landlord, the payee shall forthwith inform the payer of that fact and of the name and address of the superior landlord; and section 48(4) shall then apply as if the superior landlord were the payee.