s.2(1): the 'common duty of care' — a duty to take such care as is reasonable in all the circumstances to see that the visitor is reasonably safe in using the premises for the purposes for which they are invited or permitted to be there. Higher standard owed to children (s.2(3)(a) — allurements doctrine). Can expect professionals to guard against risks of their calling (s.2(3)(b) — Roles v Nathan [1963]).