Hi Pannetone
My DS (has same 2 dx's as years) is in his 3rd year at Uni so we've been through the process.
You'll need an Ed Pysch report done since he was 16. With that you can apply to your local Council for Disabled Students Allowance.
The Council will fund an assessment of his full needs at Uni. the assessor can be the Diasability Team from the Uni, a NAS assessor or anyone else qualified. I used the Uni's own Disability team as they would be familiar with the sorts of problems he may fact at that Uni.
The assessors will write a report sttaing what he he will require. That can be equipment: laptop, printer. dictaphone etc. help getting around the campus, 1:1 support in lessons etc. Anything at all that he requires to help him study. Mine gets extra 25% time in exmas and an exam roonm of hid own.
The assessors report is then sent to the Local Authority for them to agree to fund it. (I queried what would happen if they disagreed with the level of support but was told they had never had an instance of the LA refusing).
DS received the equipment before start of course and continues to receive support and mentoring.
Is your son planning to live on campus? If so, does he claim DLA? If he does he'll be enetitled to Housing Benefit on campus.
DS's grades wre below those the Uni normally required. I wrote to the Uni pointing out that his severe anxisety had adversely impacted his A level results and that because of inability to live independently he had to go to the local Uni - so unless they would admit him he would not be able to study at HE.
They gave him a place and he's predicted to gte a 2.1
Definitely disclose evrything. You'll find there is excellent support and understanding.
Best wishes