I am not long back from NFC anf had the unfortunate task of trying to get a taxi to Varna ( a 2 hour drive away) Anyway met a lovely english lady who does loads of services, as well as Taxi. She was the best price and was so helpful with loads of other things - details are Sherie tel 0035955471036 or visit her website
www.bulgariansaferide.com. She is really lovely and very reasonable. She also has an honesty clause which she got done in England which shows she has no criminal record etc, just for that extra peace of mind