The International FFA School'2025, which will be held at RAL, Harwell, UK from September 14th to September 15th. During these two days, lectures given by accelerator specialists will present the most up-to-date concepts in physics and technologies of FFAs. The aim of these lectures is to stimulate the interests of students and scientists wishing to deepen their knowledge in this field. Subjects to be covered are beam optics, computer modelling, high beam current issues, hardware design technique on magnets and rf cavities. Please note, there is no fee for students, teachers and staff.