What relationship exists between an occupier and an invitee?

The foregoing is a summary of the evidence. Counsel admit that the legal relationship between the parties at all relevant times was that of occupier and invitee. The liability of an occupier to an invitee was stated by Willes, J., in Indermaur v. Dames (1886), L.R. 1 C.P. 274; 35 L.J.C.P. 184, at p. 190, as follows: "And, with respect to such a visitor at least, we consider it settled law that he, using reasonable care on his part for his own safety, is entitled to expect that the occupier shall, on his part use reasonable care to prevent damage from unusual danger which he knows or ought to know, ..."