Thanks so much for all of your replies; it's very encouraging to know there are others who have already gotten this to work!

Thanks to your suggestions I've managed to make the RBs playable, at least for a couple of turns (haven't tested it beyond that). My mistake, in particular, was that in the top section of descr_strat, instead of typing in "romano_british", I had typed in "romano-british" with a hyphen. Once I fixed that, their icon appeared on the menu, and once I got rid of "dead_until_resurrected" I was able to start them up.

I made London rebel-held and empty of enemy units, so on the first turn I was able to take an army to the town and take it without a fight. That put to rest one of my fears: namely, that if I took London as the RB, the game would crash.

I'm still in the very initial stages of playing around with it, so I'm "cautiously optimistic", but very pleased I got it to work so far. In particular I'm concerned about the game crashing when the Romano-British faction is destroyed, say while I'm playing as another faction. Also, I'd like to give London back to the WRE; I wonder if the game will crash when the RBs take London from the WRE? Will have to test all that.

Thanks again for all your help. I'll definitely be back to bug you all if something goes wrong.

CountMRVHS