The JAR minimum MDA/visibility for circling are a follows: Cat A 400'/1500m, Cat B 500'/1600m, Cat C 600'/2400m, Cat D 700'/3600m. Obviously more restrictive minima for the specific location may apply.
My understanding is that there is no approach ban type restriction based on the ceiling alone, it just applies to the visibility. It sounds like your company may be applying rules or guidance for ceilings reported lower than MDA.
Is that what you were asking?