The good news: Looks like we've salvaged ALL content.
The other news: It hasn't stopped me having a ruthless pruning spree of ancient content and inactive users
The bad news: It still isn't ready to go live. The permissions and forum visibility options aren't right. Altered every setting I think should sort it and can't, so it's back with vBulletin to look at as it must be the inherited permissions clashing with the permissions on the current forum template.
Will update again in a few more days. Meanwhle Project Binky episode 10 is up, check it out, it's brilliant: