"Durmstrang is in northern Scandinavia - the very north of Sweden or Norway and that is somewhere near Cannes in the south of France. She says she doesn't know for certain because, of course, the exact whereabouts of these schools is a closely-guarded secret to which she is not privy!"
I have added this to our "Fan Challenge" list of lost interviews. E-mail me, please, if you have preserved this transcript somewhere. Thanks for tip Constance!
Later edit: Meann has confirmed that the reading took place: BBC News
Edit #2: More digging! I have found a fan report of the reading from the archives of Harry Potter for Grown Ups, and written to the woman who posted the report. Jules found a Mugglenet editorial that comes to the same conclusions but doesn't cite the Glasgow reading, and roonwit found another confirmation [pdf] that the reading really took place.