18.—(1) Before the end of 10 working days starting with the first working day after which the notice is given under regulation 16(1) or 17(1) (unless this period is extended by the investigator)—
(a)the member concerned may provide a written or oral statement relating to any matter under investigation to the investigator; and
(b)the member concerned or his police friend may provide any relevant documents to the investigator.
(2) The investigator shall, as part of his investigation, consider any such statement or document and shall make a record of having received it.
(3) In this regulation “relevant document”—
(a)means a document relating to any matter under investigation; and
(b)includes such a document containing suggestions as to lines of inquiry to be pursued or witnesses to be interviewed.