The practice is involved in the training of GP Registrars who will be working at the practice periodically.
A GP Registrar or GP trainee is a qualified doctor who is training to become a GP through actively working in practice. They will usually have spent at least two years working in a hospital before you see them in a practice and are closely supervised by a senior GP or trainer.
From time to time the practice is involved in the training of medical students. If you object to a student being present during a consultation please advise the receptionist.