30. For the purposes of regulation 27, a claimant is to be regarded as having good cause for failing to comply with a notice under regulation 23—
(a)where, if regulation 5(1) applies in his case, he was required to attend at a time less than 48 hours from receipt by him of the notice;
(b)where, if regulation 5(2) applies in his case, he was required to attend at a time less than 24 hours from receipt by him of the notice;
(c)where he was, in accordance with regulation 14(1)(a)—(g), (k)—(n) or 14(2), treated as available for employment on the day on which he failed to attend;
(d)where the day on which he failed to attend falls in a week in which he was, in accordance with regulation 19(1)(p) and 19(2), treated as actively seeking employment.