I am practising but not in a typical role, for example, involved in health screening/coroner, etc.

Audit is a quality improvement exercise and involves reflection on your practice - whatever that constitutes. I am sure you have guidelines with regard to how you carry out your work/duties and you should take the guidelines, which related to an aspect of your work, and use them for your audit. The Medical Council has stated that the following are included in acceptable audits:

Measurement of individual compliance with guidelines/protocols.

• Skills analysis.
• Department/practice audit.
• Directly Observed Procedures (DOPS).
• Evaluation of individual risk incidents/complaints.
• Patient satisfaction.
• Self assessment.
• Peer review.
• Work Site Visits (Occupational Medicine).

Source: ICGP Director of Research