Refusal to issue or revocation of licence
9.—(1)  Notwithstanding anything in these Rules, the Registrar may refuse to issue a licence or may revoke a licence already issued, without assigning any reason if —
(a)he is satisfied that the licence applied for or issued is not the appropriate licence for the motor vehicle concerned;
(b)he considers that the motor vehicle is unsuitable for use;
(c)he considers that the motor vehicle has been or is intended to be used for an unlawful purpose or in an unlawful manner;
(d)it appears to him that the person applying for or holding a licence is not a fit and proper person to hold a licence; or
(e)it appears to him that there has been a breach of any of the conditions, under which a licence is issued, or any of these Rules.
(2)  For the purpose of satisfying himself in regard to any of the matters specified in paragraph (1), the Registrar may require the motor vehicle to be produced for inspection or may require the production of other sufficient evidence.