21.—(1) The Secretary of State shall, as soon as practicable after receipt of the preliminary information, supply a questionnaire to the relevant authority.
(2) The relevant authority shall, within such period as the Secretary of State may specify in writing, being not less than 21 days from the date on which the questionnaire was supplied, submit to the Secretary of State and copy to the appellant a completed questionnaire and a copy of the documents referred to in that questionnaire.
(3) The questionnaire shall state the date on which it is submitted to the Secretary of State.