Under English common law, you have no duty to act. An ordinary person cannot be held liable for something that happened because they chose to do nothing. If you are walking beside a lake on a summer evening, hear cries of ‘help!’ and notice a swimmer flailing their arms, you are under no legal obligation to do anything. You do not have to call for help or throw them a lifebuoy, let alone dive into the water to save them. You could idle on the shore and watch them slip beneath the surface, for all an English court would hold you accountable. This principle applies not only to ordinary citizens, but also to those explicitly charged with the protection of the public. The police and other emergency services are under no special obligation to act. If a police officer stood by and watched the swimmer drown, the courts would come to the same conclusion – so long as the officer didn’t make the situation worse.