3) Circ. Min. Visibility is quoted for planning purposes and doesn't play a role in consideration of an approach ban: you may proceed with the circle as long as you have Vis Ref and 800m RVR or more (if reported)
The fog^H^H^H plot thickens.
That's a very interesting interpretation of Appendix 1 to JAR-OPS 1.430 paras (f) and (g). So if I turn a circling approach into a visual approach, I can just ignore the (much higher) Table 8 met vis minima?!