Before a rail safety officer enters railway premises (not being a public place) under section 74 , the rail safety officer must give the occupier of the railway premises reasonable notice of the intention to enter, unless –

(a) the giving of the notice would be reasonably likely to defeat the purpose for which it is intended to enter the premises; or

(b) entry to the premises is made with the consent of the occupier of the premises; or

(c) entry is required in circumstances where the rail safety officer reasonably believes there is an immediate risk to safety because of the carrying out of railway operations at the premises; or

(d) entry is authorised by a search warrant.