Ambulance Service Act 1991

An investigation officer may enter a place if—

an occupier of the place consents to the entry; or

it is a public place and the entry is made when it is open to the public.

For the purpose of asking the occupier of a place for consent to enter, an investigation officer may, without the occupier’s consent or a warrant—

enter land around premises at the place to an extent that is reasonable to contact the occupier; or

enter part of the place the officer reasonably considers members of the public ordinarily are allowed to enter when they wish to contact the occupier.

In this section—

a place to which members of the public have access as of right, whether or not on payment of a fee and whether or not access to the place may be restricted at particular times or for particular purposes; or

a part of a place that the occupier of the place allows members of the public to enter, but only while the place is ordinarily open to members of the public.