Using -mod:my_mod

[Makanyane]

Cheers Dol Guldur, many, many thanks.... I wasn't thinking about packs so that one was never going to occur to me!
I just tried and it seems to work fine for both cities and the sea terrain files.

Now just need to find a home for a very nice intro video. Assuming all else fails (which seems likely) think I'll just give instructions for re-instating / switching to the old one as when you copy the BI folder the vanilla one must automatically end up in modfolder, hmm....