Paraphrase this paragraph in a more proper and well detailed paragraph; For every 20 people employed, one person needs to be trained as a First Aider and a separate person as a Health and Safety Representative. Appointments need to be made in writin

In the workplace, it is mandated that for every 20 employees, at least one individual should be designated as a First Aider, while another must be appointed as a Health and Safety Representative. These appointments must be documented in writing, ensuring that each individual comprehensively understands their roles and responsibilities prior to endorsing the agreement with their signatures. It is permissible for these roles to be filled by current employees; however, such appointments carry additional duties that must be acknowledged. Furthermore, it is recommended to have an extra individual trained in these capacities, as personnel may resign or be unavailable due to various reasons, potentially leaving the workplace without a First Aider present in critical situations.