The College of Policing issued advice on stalking or harassment crimes to police first responders in April 2019, which makes clear that Police Information Notices (PINs) will no longer be used in stalking or harassment cases.
In April and again in September 2019, Deputy Chief Constable Paul Mills, the National Police Chiefs’ Council Lead on Stalking or Harassment, wrote to all Chief Constables, inviting them, if they had not done so before, to consider withdrawing PINs within their policing area with immediate effect. He also asked them, once PINs had been withdrawn, to satisfy themselves that PINs or their equivalent were not still being used by officers when responding to stalking or harassment offences. I understand that all police forces have now stopped using PINs.
As PINs were a non-legislative tool, responsibility for any appeals process against previously issued PINs sits with individual Chief Constables.