If anyone is going to Borovets soon can you ask around to see if Alex Kraschev(think that was his surname) is still an instructor with the samokov Ski School based at the hotel of the same name. His English was a bit ropey but the skiing was better!
A group of us went the other year and he was our instructor and really good so if he's still there we might book again for this year.
Cheers.