Occupational Health Assessment

So I have a question if anyone can help

I have never had an Occupational Health Assessment for a job before as I have never disclosed my autism for a new job before so I didn't know what to expect or how it all worked.

However, some of the things in my reasonable adjustments havn't been followed by my manager and it now occurs to me that I never actually saw a copy of the report. The nurse who did my assessment over the phone never mentioned how I could see a copy of it and my employer never offered to show it to me

I have researched it and I believe I have a legal right to view a copy of it, however I don't know how to go about this

Have I left it too late?
Also do I contact my employer or the Occupational Health People (who I wouldn't know how to contact)?