Subject to paragraph (2), the questionnaire referred to in regulation 24 (registration of interest and the issuing of questionnaires) may take such form and contain such questions and other material as the TRA considers appropriate for the purpose of the investigation.

A questionnaire must set out the date by which it must be returned to the TRA.

Where, following a review of the returned questionnaire, the TRA determines that it is incomplete or that the information supplied to it is inadequate, it may issue a notice to the relevant interested party or contributor requesting clarification or supplementary information (a “deficiency notice”).

The deficiency notice must set out a time limit by which any missing, clarificatory or supplementary information is to be supplied.