This page is the specification behind every flag, index and grade on the procurement pages. It is published so the flags can be checked and argued with: the definitions used to live only in code, which made a claim about a named company unfalsifiable from outside.
What it covers
13 contract-level checks and 4 procedure-level ones — threshold, what each means, and when it is evaluated.
Why the denominator is the checks that could be evaluated rather than all of them.
The two DIFFERENT weight sets behind the A–F buyer and supplier grades.
Alignment with OCP's Red Flags for Integrity (2024) and iMonitor 2.0, including the checks that map to nothing there.
Known limits, including the research finding red flags weakly related to corruption.
A flag is not a verdict. A fired check means the behaviour is worth a second look — it may be entirely lawful, lawful but poor value, or illicit. The machine-readable catalogue is at risk-flags.json; see also public procurement.