A first-aider must hold a valid certificate of competence, issued by an organisation whose training and qualifications are approved by the HSE.
A First Aid at Work certificate is only valid for three years. Employers should arrange refresher training and competence testing at least three months before certificates expire. If a certificate expires the individual will have to undertake another full course of training. The standard first-aid-at-work training does not include resuscitation procedures for children, but training organisations will often tailor courses to schools’ needs.
Schools should keep a record of first-aiders and their certification dates.
Source: Guidance on First Aid for Schools: A Good Practice Guide.