Hi tooki,
Yeah, your advice fits. I tried to find a solution with Illustrator before posting here, and I even set up a batch conversion in Photoshop (but of course I can't edit rasterised text, at least not easily).
You're right, the only solution is to get ahold of the original docs, I've got some queries out, but I'm about 6 people removed from whomever wrote them :-/
Thanks again, at least you've saved me from any more useless attempts.
Chas