143Failure to leave licensed premises etc.E+W
(1)A person who is drunk or disorderly commits an offence if, without reasonable excuse—
(a)he fails to leave relevant premises when requested to do so by a constable or by a person to whom subsection (2) applies, or
(b)he enters or attempts to enter relevant premises after a constable or a person to whom subsection (2) applies has requested him not to enter.
(2)This subsection applies—
(a)to any person who works at the premises in a capacity, whether paid or unpaid, which authorises him to make such a request,
(b)in the case of licensed premises, to—
(i)the holder of a premises licence in respect of the premises, or
(ii)the designated premises supervisor (if any) under such a licence,
(c)in the case of premises in respect of which a club premises certificate has effect, to any member or officer of the club which holds the certificate who is present on the premises in a capacity which enables him to make such a request, and
(d)in the case of premises which may be used for a permitted temporary activity by virtue of Part 5, to the premises user in relation to the temporary event notice in question.
(3)A person guilty of an offence under subsection (1) is liable on summary conviction to a fine not exceeding level 1 on the standard scale.
(4)On being requested to do so by a person to whom subsection (2) applies, a constable must—
(a)help to expel from relevant premises a person who is drunk or disorderly;
(b)help to prevent such a person from entering relevant premises.