85.—(1) Where a claim for housing benefit has been sent or delivered to an office of a designated authority in accordance with regulation 83(4)(e), the date on which the claim is made shall be—
(a)except where paragraph (b) applies, the date the claim is received at the office of the designated authority; or
(b)where in the one month before the claim is received in an office of a designated authority, the person making the claim or a person acting on his behalf had notified an office of a designated authority of his intention to make such a claim, the date the notification was given.
(2) A notification of intention to make a claim is deemed to be given on the date on which notification of the intention to claim housing benefit is received, in whatever form, from the claimant, or the person acting on his behalf, at an office of a designated authority.
(3) Paragraph (2) applies where neither income support nor a jobseeker's allowance is claimed in conjunction with housing benefit.
(4) Where the person claiming housing benefit in accordance with regulation 83(4)(e), or the partner of that person—
(a)has an award of income support or income-based jobseeker's allowance; or
(b)has claimed such a benefit but no award has been made,
the date on which the claim for housing benefit is made shall be determined as if sub-paragraphs (a), (b), (c) and (e) of paragraph (1) of regulation 84 applied to that claim as they apply to claims under regulation 83(4)(d).