Regulation 18
(1)
Subject to paragraph (2) of this regulation, information on any subject except that mentioned in regulation 16(1)(b) may not be required to be supplied more frequently than once in every 28 days nor in respect of periods of less than 28 days.
(2)
Information on the subject mentioned in regulation 16(1)(b) may not be required to be supplied more frequently than once in every 3 months nor in respect of periods of less than 3 months.