Employers are responsible for the provision of appropriate first-aid  equipment, facilities and first-aid personnel in respect of their  employees – this includes schools, as they are workplaces. Although the  Regulations do not require employers to provide first aid for anyone  else.
We strongly encourage employers to consider non-employees when  carrying out their first-aid needs assessment and to make provision for  them.
The Department of Education has produced a booklet: Guidance on First Aid for Schools.