Further Update:
So applied to Oxford with his A*A*A* plus A* EPQ. Was given two interviews with Merton and two with Jesus College. Sadly, 3 out of 4 interviews didn't go well as they kept cutting in while he was explaining his thought process. His Asperger's just took over and its likely he didn't come across as well as a result. In reality, we will never know why he wasn't given an offer; last year he requested some feedback but they seem to send out generic letters saying that competition was extremely high etc.
He had a clear picture of what the next few years would look like, so currently in a period of mourning, not sleeping etc. I know people shouldn't set their heart on things, but he is not neurotypical so this was never going to be the case with this.
In the meantime he does have an offer from Durham; he likes the course but accommodation, not so much. He is also investigating a degree apprenticeship with BAE which I hope improves his mindset.
He will attend an offers day if they have one, and I hope this will help him over the coming months.