Provides practical guidance for those who have to prepare emergency plans, and those who have to respond to them including operators, local authorities, emergency services, health authorities and health boards. Provides guidance on good practice for emergency planning under the Control of Major Accident Hazards Regulations 1999 (COMAH). Contents: Legal requirements; General issues on emergency planning; On-site emergency plans; Off-site emergency plans; Public health aspects of major accidents; Environmental aspects of major accidents; Training and testing; Initiation of emergency plans; Review and revision; Informing and warning the public; Working with the media; Appendices.