(1) For monitoring compliance with this Act, an inspector may—
(a) enter any premises; and
(b) exercise the monitoring powers stated in section 153.
(2) An inspector may enter premises under subsection (1) only if—
(a) the occupier of the premises has consented to the entry; or
(b) the entry is made under a warrant under section 172; or
(c) the occupier of the premises is a licence holder, or a person covered by a licence, and the entry is at a reasonable time.
(3) However, subsection (2) (c) does not authorise entry into any part of premises that is being used solely for residential purposes.