The Claimant, aged 18, was injured diving into a lake. Like many others, he had ignored a sign: “Dangerous water: no swimming”. The Council planned to make the lake inaccessible but had not yet done so through lack of funds. No duty was owed under s.1(3)(c) as it wouldn’t be reasonable to offer protection against a natural feature of the lake. The risk did not arise from anything done or omitted to be done on the premises.