GMC guidance here.
As I understand it, medical professionals (including psychiatrists) have a duty of care to protect the future health and wellbeing of their patients and others. So, for example. if a patient told his psychiatrist he was going to go home and beat his wife, the psychiatrist would be duty bound to inform the police. Likewise, if a child disclosed ongoing sexual abuse, the psychiatrist would be obliged to inform the police. etc.
However, in a case of historical sexual abuse where the abuse stopped a long time ago, GMC guidelines would not require or recommend that the doctor inform the police. They’re doctors, not detectives.
Hypothetically, I would wish anyone who had suffered the abuse described in your post the very best of luck and courage, and would hope that the process of healing would bring them lasting peace of mind and happiness.