First you will need to create a Dynamic Group in the Data Digger for Pupil Premium students.
See - Using Data Digger for creating a Dynamic Group or Static Group of students
Head to Reporting>Data Digger, and enter Pupil Premium in the first dropdown box.
Click on the number in the blue circle and give this Group a name as you create the Dynamic Group.
Then go to Reporting > Reports > Conduct (tab) > Incidents and select Pupil Premium from the Group dropdown.
Run this report and it will provide you all the incidents involving Pupil Premium Students.
In this example, the report was named Incident PP but you can name them what you wish.