In the UK, employers have several responsibilities regarding first aid in the workplace, as outlined by the Health and Safety (First Aid) Regulations 1981. These responsibilities include:

1. Assessing First Aid Needs: Employers must conduct a risk assessment to determine the first aid requirements specific to their workplace. This assessment should consider factors such as the nature of work activities, the number of employees, and the workplace's layout and hazards.

2. Providing Adequate First Aid Equipment and Facilities: Employers are required to ensure that sufficient first aid equipment, such as first aid kits, is readily available in the workplace. Additionally, they must provide appropriate facilities for administering first aid, including access to clean water and washing facilities.

3. Appointing Competent First Aid Personnel: Employers must appoint one or more competent persons to take charge of first aid arrangements in the workplace. This may include providing first aid training to designated employees or appointing a qualified first aider.

4. Providing Information and Training: Employers must ensure that employees are aware of the first aid arrangements in place and know how to access first aid facilities and personnel. Training should be provided to appointed first aiders and may include basic first aid techniques, CPR (cardiopulmonary resuscitation), and how to respond to common workplace injuries and emergencies.

5. Reviewing and Updating First Aid Provision: Employers should regularly review their first aid arrangements to ensure they remain adequate and effective. This includes reassessing first aid needs following any significant changes in the workplace or workforce and updating training and equipment accordingly.

By fulfilling these responsibilities, employers help to ensure the health, safety, and well-being of their employees in the event of a workplace injury or medical emergency.