20. The competent authority must modify a certificate or licence in respect of an operation, category of animal or (where appropriate) type of equipment as requested by an applicant if—
(a)the applicant meets the conditions in regulation 8 or 16 (as the case may be) in respect of the modification; and
(b)the competent authority is satisfied the applicant is a fit and proper person to hold a certificate or licence, as modified.