where the Ministry is satisfied that the licence-holder or any person acting on his behalf has contravened or failed to comply with any condition of the licence; or

where the licence-holder is convicted of an offence under any provision of this Act; or

where the Ministry is not satisfied that the prescribed standards are being observed or that an adequate standard of husbandry is being practised, and it does not appear to the Ministry that those standards can or will be observed or (as the case may be) that the standard of husbandry will be rendered adequate within a reasonable period; or

where the licence has been suspended and any action of which particulars have been served under sub-paragraph (2)( b) of paragraph 6, or any such action as modified in consequence of the review mentioned in sub-paragraph (3) of that paragraph, has not been completed to the satisfaction of the Ministry within the period, or any extended period, of the suspension; or

on any ground on which the Ministry might have refused to issue a licence.