I attended Lancaster. I told them I was autistic - after initially being hesitant to declare it on UCAS - sent in the documents to prove it, reams upon reams of documents that involved my parents contacting someone at the local hospital I used to see as an older child (which included very personal details - e.g. about phobias that stemmed from being autistic - that I really didn't want anyone else knowing about), and they told me it wasn't enough - like they didn't believe me, it was misdiagnosed, or as if it could've 'gone away' in the intervening years since the diagnosis and subsequent visits to various medical professionals - and they, effectively, wanted me to get re-diagnosed. I wasn't putting myself through such a mortifying, humiliating experience, and me not having been to a GP since I was 11 (bar one fleeting visit at 15) would've probably made things worse in trying to do what they wanted. They just said it in the email, as if it was the easiest thing in the world; go to a GP and have them write a letter proving you've (still) got ASD, as if they wanted to make sure I still had it and they weren't providing support they didn't need to.
I didn't do that, didn't respond, and I never heard from them again; I didn't want to risk it going against me and somehow my masking, or getting an unsympathetic doctor, being sufficient to having my diagnosis ripped away from me. I was there for three years, plus a year at postgrad (and they wondered why I didn't declare my disability to the uni when I applied for that!). I was privy to other students' bad experiences with its disability team too (including people with far more physical disabilities who talked about repeatedly hitting brick walls and getting nowhere when they asked for support), although perhaps I just happened to be around people with less-than-positive experiences of the service, and the good experiences don't really get talked about because you're only gonna really talk about the service if it's something you feel let down by, if that makes sense.
So if you want to go there - unless you're just gathering experiences etc. for some other reason - be careful and be ready to fight your corner. I didn't really care one way or the other, as I hated the way I was mollycoddled throughout school due to my disability and the level of bureaucracy that being open about it at uni appeared to entail put me off doing anything about it. The only thing is that the ADHD I was also diagnosed with as a young age - which I didn't know about until a few years ago - started to flare up noticeably during my Master's, and it meant I'm receiving a lower award as a result of its effect on my studies; perhaps somehow receiving support for my ASD could've helped with that, even though I would've hated having to go see someone every so often ON TOP of my tutor as a result of that (with both my undergrad and postgrad tutors, I had as few meetings with them as possible as I just wanted to be left alone to get on rather than being forced to see someone and have them make me do things I simply don't have the energy for if I somehow gave off concerns; I talked about this hatred of bureaucracy earlier).
I'm posting this anonymously for my own privacy, as I don't want this post full of personal anecdotes linked to my long-term, if mostly inactive, account. Aside from this (and their recent failure to adequately communicate with me regarding resits that meant I missed them), I don't really have anything against the uni. I wouldn't say I enjoyed my time there, but more on the content/indifferent side of how I view my four years there (almost five if you count how long it's taken them to decide what award for my postgrad studies I'm getting; I'm STILL enrolled as a student because of that).