I don't know how you do things on your side of the ocean, but why not contact the actual flight instructor who gave you the instruction...he would log it in his book too. He might redo it for nothing...but give him something...it is your situation not his.
I know one can reconstructa log book...I've even seen people reconstruct it with more flying time than they had in the first log book...it can be certfied by a local inspector (FAA here)