Well, the most recent visits to the office ran as planned and on the 22nd of August my girlfriend was interviewed by an immigration officer at the Pernik office. The questions weren't particularly searching in content and the only one which crept in which made 'delay' spring into my mind was when he told her that he might want her to produce some document from Taiwan proving that she wasn't already married. But when she said this would be 'no problem', he immediately lost interest in the idea..
Then it was on into the camera room for a quick snap, snap, grin, grin, wink, wink and the new Lichna Karte was placed into her hot little hand at the next visit on the 25th. It's valid until my card expires in August 2014.
So we got there in the end - and not a marriage certificate in sight!!
Thanks for all your suggestions and advice en route....
Thanks also to Orli Stanoikov, our very good translator. I'll be putting a recommendation of his services elsewhere on MyBG.