Hi,
am not 100% sure what the HPC wants, but here a few suggestions:
Send in your:
Peer reviews, Performance appraisals, course certificates and reflections on how they affected your clinical practice, audits you might have undertaken, literature critiques + reflection, done any competency examinations ? (like I had to do them at our ICU for the on-call duties), any presentations you have given + feedback, supervision session documentations, clinical objectives, ...

Just add anything you would have usually put into your "professional development folder".
Hope this helps.
Good luck,
Fyzzio