Guys... My apologies if I sound like a jerk here, but in the time it's taken going back and forth to even get to this point any competent luthier (or even anyone handy with a hand drill) could have had this fixed and playing by now. LOL I wish I was closer. I certainly don't claim to be a luthier, but this isn't rocket science and I could easily have just done it for you.
If what I assume you're needing done is what I think it is, this really is a simple fix:
Remove the old nut
Fill existing holes (use whatever method you feel comfortable with.. toothpicks w/superglue, dowel rods, a mix of sawdust and super glue, etc..) and lightly sand until level.
Re-position new nut so it's flush with the end of the fret board, and use something sharp to mark where the new holes will be...
Find a drill bit just slightly smaller than the mounting screws to drill the new mounting holes (use a piece of masking tape on the bit to make a "depth gauge" so you don't drill too deep)
Remount the new nut.
VIOLA... You're done.
If any "luthier" tries to charge you £100 to do this job, I'd tell them to get bent! This isn't like fixing a broken headstock. LOL