19. Where the Authority gives a notice under regulation 18(1), the applicant must comply with that request within—
(a)three months of the date of the notice if the information is a new Energy Performance Certificate and regulation 18(1)(c) applies;
(b)three months of the date of the notice if the heat generated by the plant for which accreditation is being sought must be metered under regulation 13 and the information is evidence that the metering requirements are met; or
(c)28 days of the date of the notice in any other case.