In the UK, employers have legal responsibilities regarding lone working to ensure the health and safety of their employees. These responsibilities are outlined in various health and safety legislation, including the Health and Safety at Work Act 1974 and the Management of Health and Safety at Work Regulations 1999. Here are some key aspects of employers' legal responsibilities regarding lone working:

1. Risk Assessment: Employers must conduct a thorough risk assessment of lone working activities to identify potential hazards and assess the associated risks. This assessment should consider factors such as the nature of the work, the location, the individual's experience and training, and the availability of communication and support systems.

2. Implementing Control Measures: Based on the risk assessment, employers must implement appropriate control measures to mitigate the risks associated with lone working. This may include providing training and supervision, ensuring access to emergency communication devices (such as mobile phones or lone worker alarms), establishing check-in procedures, and identifying emergency response protocols.

3. Providing Information and Training: Employers must provide lone workers with adequate information, instruction, and training to safely carry out their duties. This includes training on the risks associated with lone working, procedures for reporting incidents or emergencies, and how to use any necessary equipment or communication devices.

4. Monitoring and Review: Employers should regularly monitor lone working arrangements to ensure they remain effective and safe. This may involve periodic checks on lone workers, reviewing incident reports, and soliciting feedback from employees. Employers should also review and update risk assessments as necessary, particularly following any significant changes in work activities or conditions.

5. Health Surveillance: Employers may have a duty to provide health surveillance for lone workers if they are exposed to specific hazards that could affect their health. This may involve monitoring for signs of stress, fatigue, or other health issues related to lone working activities.

By fulfilling these legal responsibilities, employers can help to protect the health, safety, and well-being of lone workers and ensure compliance with relevant health and safety legislation.