"those things which are incident to, and may reasonably and properly be done under the main purpose, though they may not be literally within it, would not be prohibited."
" 135 Warrant to search for and remove patients (1) If it appears to a justice of the peace, on information on oath laid by an approved social worker, that there is reasonable cause to suspect that a person believed to be suffering from mental disorder- (a) has been, or is being, ill-treated, neglected or kept otherwise than under proper control, in any place within the jurisdiction of the justice, or (b) being unable to care for himself, is living alone in any such place, the justice may issue a warrant authorising any constable…to enter, if need be by force, any premises specified in the warrant in which that person is believed to be, and, if thought fit, to remove him to a place of safety with a view to the making of an application in respect of him under Part II of this Act, or of other arrangements for his treatment or care. … (3) A patient who is removed to a place of safety in the execution of a warrant issued under this section may be detained there for a period not exceeding 72 hours. (4) In the execution of a warrant issued under subsection (1) above, a constable shall be accompanied by an approved social worker and by a registered medical practitioner, . . . (5) It shall not be necessary in any information or warrant under subsection (1) above to name the patient concerned. (6) In the section "place of safety" means residential accommodation provided by a local social services authority underPart III of the National Assistance Act 1948 , a hospital as defined by this Act, a police station, a mental nursing home or residential home for mentally disordered persons or any other suitable place the occupier of which is willing temporarily to receive the patient."