If the changes are minor enough, your save-game should be able to work without them, though you'd probably have to clean them first with Wyre Bash.
Nah, it's not a question of getting the savegame to work, I'm trying to rescue the .esp. It's no biggie though, I've got a Word document with the script saved in it. It's a little script that means that NPC vampires burn up if they come out into the sunlight. I was just hoping to avoid having to add the script to each of the NPC vampires in the game by recovering the .esp from when I did it before. Hey ho, I'll just put aside a little time to get on it
Thanks anyway.