Occupiers' Liability Act 1984 - Trespassers
Section 1(3) of the Occupiers' Liability Act 1984 - the occupier owes a duty if:
A) They are aware of the danger or has reasonable grounds to believe it exists.
B) They know or has reasonable grounds to believe that the other is in the vicinity of the danger concerned.
C) The risk is one the occupier is reasonable expected to offer the other some protection.