Hey!
I'm an ex-student of yours from Sofia University. :) I think I've seen the English copy of Под игото in our library (that is now also the British Council library). Today I'm going there to return some books so I'll look for it.
If it's there I can take it and give it to you (of course as long as you don't forget returning it :)))
By the way, I'm following your blog and so do some of my classmates so we haven't forgotten you. :)