For regulation 6(1) of the principal Regulations (determination of average weekly amount of specified payments) there shall be substituted the following paragraph—
(1) For the purposes of section 35A(4) of the Contributions and Benefits Act a woman’s average weekly amount of specified payments shall, subject to paragraph (2), be determined by dividing by 13 the payments made, or treated in accordance with these Regulations as made, to her or for her benefit—
(a) in the case of a woman to whom paragraph (2) of regulation 5 applies, in the 13 weeks referred to in that paragraph;
(b) in any other case, in the 13 weeks (whether consecutive or not) falling within the specified period in which such payments are greatest.