Thank you all! It's in December, for Geography. He has 45 mins at the start, invigilated, to read through some material and then the interview after that. He's pleased because the interviewers are people he's come across before in online lectures (which are still on YouTube for him to rewatch). The information says he can do it at school or home, and I'm hoping school will facilitate this for him because the pressure on us if something goes wrong is huge! Plus he can wear his uniform, I guess.