Bookworm: As I said "That's what the ops manual I fly to has to say, anyhow - as with any PT operation, the details may vary from operator to operator, so it all has to be taken with a health warning......"; various companies' FMs will all have their own (CAA inspected and approved) interpretations of JAR-OPS, and whilst JAR-OPS is a useful reference in its own right, when flying to a company FM - that is your ultimate reference. Ours quotes the 3.6k of table 8 as a planning reference as it refers to an in-flight visibility and so if you have the required detailed visual references you are considered to be compliant for the circle provided you have 800m RVR if reported (to cover you for the dangers associated with MIFG). Also, FM's (like JAR-OPS-1) are subject to edits, changes and volte-faces!!!!