https://www.gov.uk/trainee-driving-instructor-licence-the-rules?utm_source=internal&utm_medium=inline-link&utm_campaign=understanding-adi-part-2-test-result&utm_content=about-your-result
How to get and use a trainee driving instructor licence to help you qualify as an approved driving instructor (ADI)
trainee driving instructorgov ukgetlicenceoverview