i thought i'd put together a zone sector generator in excel just to quickly crank out the sectors, after all there's 400 in a zone and that's a lot of dice rolling for any mans wrist to handle :)
Its an xlsx file using vlookups and simple formulas - it follows the maths of the tables in the book exactly but there's no nasty macros in the background so your anti virus scanners should be fine.
I'm not great with Excel so it's a bit rough, but hopefully it will help you when filling out your Zone.
This is a direct link to the zip file - there's no password nor is there any protection on the excel file.
Thanks to Chris and Tomas for letting me share this.