No. In the UK, it is very unlikely that someone who acted in good faith when trying to help a person in cardiac arrest would face any legal liability. No action has ever been successfully brought against a bystander who performed CPR in the UK. The courts look favourably on those who go to the assistance of others in an emergency, and performing CPR on someone in cardiac arrest cannot make their situation worse. If you are concerned, the important thing is simply to act — calling 999, starting CPR, and using a defibrillator if one is available. For specific legal questions, the Resuscitation Council UK provides further guidance.
