The document provides an in-depth analysis of the Polish Leniency Programme, detailing its conditions, procedures, and implications for private enforcement of competition law. It highlights the relationship between leniency schemes and private antitrust actions, including how leniency applicants can access evidence and the impact of UOKiK decisions on civil lawsuits. The authors offer suggestions for improving the effectiveness of the leniency programme while respecting the rights of private parties to seek compensation.