Ok, trying again to force host........
Edit: I think we have success
I didn't get any error messages from the llamaserver, the hosting appears to have taken place without a problem, and everything seems to be as ordered with regards my turn.
Can everyone please report if you have any problems at all though. Sometimes during rollbacks you can get some weird stuff happening (random commanders appearing etc). So I'd like to try and locate any problems like that now, and not have to come back to them at a future point when someone says "hey, I've just noticed a load of weird things".
But hopefully the game is now back on track. So I'd like to thank you all for you time, patience, and cooperation in getting the error resolved