Explain the law on occupier's liability, what is an occupier?, include the occupiers liability Act, how they owe a duty of care. include to this case: Mary, aged 50, works for Blocks, Box and Sales, wholesale food division. She had previously (5 years before) been involved in a car accident, which resulted in serious injuries to her left leg, and meant that her left leg was shorter than the right and she had to use a walking stick to get around. One day at work, as she is crossing the floor, at the wholesale depot, a crate fell from its stack, pinned her to the ground and she suffered injuries to her back and partial amputation to her right leg, which resulted in Mary being wheelchair bound.