293.—(1) This section applies if it appears to a lay magistrate, on complaint on oath made by an authorised person—
(a)that there is reasonable cause to believe that a person who may be taken into custody by virtue of a provision mentioned in subsection (3)(a) or (b) (a “relevant person”) is to be found on any premises, and
(b)that admission to the premises has been refused or that a refusal of such admission is apprehended.
(2) The lay magistrate may issue a warrant authorising any constable accompanied by a medical practitioner to enter the premises, if need be by force, and remove the relevant person.
(3) In this section “authorised person” means a person authorised by or under—
(a)section 88 of the Mental Health Act 1983, or
(b)article 8 of the Mental Health (Care and Treatment) (Scotland) Act 2003 (Consequential Provisions) Order 2005,
to take any relevant person into custody in Northern Ireland.