Just an update for the nerds interested.
There were two culprits:
- The one that looked like 'nbot' turned out to be Amazon, indexing the content for its stupid Alexa gizmo. If anyone has one of these devices and is asking it questions about FE/FC Holdens, sorry about that. It's no longer crawling the site.
- Facebook - seems to be related to people posting links to stuff on the forum to Facebook groups, although the rate that occurs (that I see) doesn't scale with the amount of traffic. Anyway, they're blocked too.
It doesn't look like the bandwidth limit will blow this month.