Annual leave entitlement carry over from other NHS jobs

I saw a thread here earlier that mentioned people were able to claim extra annual leave for their service in the NHS doing other jobs prior to entering medicine.

I’ve emailed my HR and they’ve essentially said that AFC annual leave does not carry over into medicine and dentistry. However, I saw many of you mentioned that’s precisely what you did.

Is there any guidance or documents that I can use to prove my case?