The Scheme Rules and Scheme Criteria are the two core documents setting out how the scheme works and the criteria to which operators will be assessed. Prospective applicants are advised to read both of these documents.
Scheme Criteria
The Scheme Criteria document explains what operators will be assessed against and the evidence that they will need to supply. This is a must-read as it is the only way to fully understand the scheme criteria and assess your readiness for audit, which can save you time and allow you to prepare for the audit itself.