(5) Paragraph (6) applies where—
(a) within 14 days of the appropriate date the enforcement authority has requested the Secretary of State to supply the relevant particulars in respect of the vehicle involved in the contravention and those particulars have not been supplied before the expiration of the 28-day period;
(b) an earlier regulation 10 penalty charge notice relating to the same contravention has been cancelled under regulation 23(5)(c); or
(c) an earlier regulation 10 penalty charge notice relating to the same contravention has been cancelled under regulation 5 of the Representations and Appeals Regulations.
(6) Where this paragraph applies, notwithstanding the expiration of the 28-day period, an enforcement authority shall continue to be entitled to serve a regulation 10 penalty charge notice—
(a) in a case falling within paragraph (5)(a), for a period of six months beginning with the appropriate date; or
(b) in a case falling within paragraph (5)(b) or (c), for a period of 4 weeks beginning with the appropriate date.