(1) A responsible licensing authority may grant or renew a licence on the conditions and restrictions it thinks fit and specifies in the licence.(2) A licence granted or renewed under this Act is subject to (a) the conditions and restrictions that are imposed on the licence by this Act or the regulations; and(b) the conditions and restrictions that are specified in the licence under subsection (1) at the time it is granted or renewed, or as varied at any other time under this section.(3) If the responsible licensing authority, either on receipt of an application for the renewal of a licence granted under this section or at any time while the licence is in force, considers it necessary or desirable in the public interest to do so, the authority may vary the conditions or restrictions to which the licence is subject under subsection (2)(b) (a) by amending the existing conditions or restrictions; or(b) by substituting new conditions or restrictions for existing conditions or restrictions; or(c) by imposing additional conditions or restrictions; or(d) by amending a list or schedule of substances which forms part of those conditions or restrictions.(4) If the responsible licensing authority varies the conditions or restrictions of a licence as provided by subsection (3) , the authority is to do one of the following:(a) cause the licence to be appropriately amended to record the variation of the conditions or restrictions and to be returned to its holder;(b) issue a new licence in place of the existing licence, specifying in the new licence the conditions or restrictions of the licence as so varied;(c) serve on the holder of the licence a notice in writing specifying the variation of the conditions or restrictions.(5) A variation of the conditions or restrictions of a licence does not have effect until the licence is returned to its holder, the new licence is issued to its holder, or the notice specifying the variation of the conditions or restrictions is served on the holder of the licence, as the case may be.