RIDDOR is UK legislation introduced in 2013 that requires employers to report and record work-related accidents, injuries, diseases, and dangerous occurrences. It aims to monitor accident trends to improve workplace safety. RIDDOR covers major injuries like fractures, amputations, and loss of sight. It also covers dangerous occurrences such as building collapses and fires that suspend work for over 24 hours. Employers must report diseases like certain poisonings and lung diseases under RIDDOR. The number of workplace accidents has declined 6% since RIDDOR was introduced, showing it has benefited workplace safety in the UK.