36.—(1) Any act required or authorised by the Act to be done by or to any person in connection with the registration of a design, or any procedure relating to a registered design, may be done by or to an agent authorised by that person orally or in writing.
(2) But an agent shall only be treated as authorised under paragraph (1) where—
(a)he was nominated by the applicant at the time of—
(i)making his application for registration;
(ii)making his application for a declaration of invalidity under section 11ZB; or
(iii)making his application under section 19(1) or (2); or
(b)he has filed Form DF1A.
(3) Where an agent has been authorised under paragraph (1), the registrar may, if he thinks fit in any particular case, require the signature or presence of his principal.