4.—(1) Subject to paragraph (2) and regulations 5 and 6, the assessment phase in relation to a claimant ends on the last day of a period of 13 weeks beginning on the first day of the assessment phase as determined under section 24(2)(a) of the Act.
(2) If at the end of the period of 13 weeks referred to in paragraph (1), it has not yet been determined whether the claimant has limited capability for work—
(a)the claimant having been assessed in accordance with a limited capability for work assessment; or
(b)as a result of the claimant being treated as having limited capability for work in accordance with regulation 20, 25, 26, 29 or regulation 33(2) (persons to be treated as having limited capability for work),
the assessment phase will end when the limited capability for work determination is made.