When is an employer required by law to contact the helth and safety executive?

An employer is required by law to contact the Health and Safety Executive (HSE) in the UK in specific situations, such as when there is a work-related fatality, a serious injury, or a diagnosed case of certain occupational diseases. They must also report dangerous occurrences or significant incidents that could lead to serious injury. Additionally, employers must inform the HSE about specific types of accidents or diseases under the Reporting of Injuries, Diseases and Dangerous Occurrences Regulations (RIDDOR). Failure to report these events can result in legal penalties.