Lord Atkin established the neighbour principle in Donoghue v Stevenson. The neighbour principle determines whether a duty of care exists by asking if a reasonable person would foresee that their actions could adversely affect another. In Donoghue, the manufacturer (D) had a duty of care towards the consumer (P) because D could reasonably foresee that selling contaminated ginger beer could injure P. P became ill after finding a decomposed snail in the ginger beer bottle. The neighbour principle held D negligent for failing to properly inspect bottles before filling them, breaching the duty of care owed to P.