5.—(1) This regulation applies for the purposes of regulation 17(4)(a) of the principal Regulations as amended by these Regulations.
(2) This regulation applies where, before 10th April 2006, a person did work in a specified period in accordance with paragraph (1B)(b), (1C)(b) or (1D)(b) of regulation 17 as it then was of the principal Regulations and the specified period would have ended after 9th April 2006.
(3) Where the specified period is the one to which paragraphs (1B)(b) or (1C)(b) of regulation 17 applied, the 52 week period beginning on the first day on which the work is done referred to in regulation 17(4)(a) shall be treated as beginning on the first day of the period specified in regulation 17(1B)(b).
(4) Where the specified period is the one to which regulation 17(1D)(b) applied, the 52 week period beginning on the first day on which the work is done referred to in regulation 17(4)(a) shall be treated as beginning on the first day of the period specified in regulation 17(1D)(b).