[Dr Sham Mahmood]

Here is a good explanation for confidential enquiries

https://www.healthknowledge.org.uk/public-health-textbook/research-methods/1c-health-care-evaluation-health-care-assessment/confidentiality-enquiry-processes

Try this guide, page 38 is helpful in highlighting the differences.

https://www.nes.scot.nhs.uk/media/346578/sea_-_full_guide_-_2011.pdf