>>>I thought it strange that a report was being sent to the PF even though I've never been charged, is this right?
I assume that the law is similar to that in England where charges are actually brought by the CPS (which, in your case, means the Procurator Fiscal), rather than by the police (even though any charges are actually laid before a defendant by the police). So the police are simply saying that they need to refer the case to the Procurator Fiscal for a decision as to whether there's now sufficient evidence to charge you.