Assessment coming soon, but I don’t want my intrusive thoughts documented

I’ll be having a mental health assessment (NHS in the UK) and I want to finally have my OCD addressed when previously it had been ignored/dismissed. I have an issue that the assessment isn’t confidential like therapy, all my notes will go onto my health record and I don’t want the details written down but I don’t know how to be taken seriously without revealing these details (I’m open to doing it in therapy when I become more comfortable)

Any advice on how to get a referral to the right place without having to reveal too much.