Did you make them aware Echogirl, about the extra 1.5tl you were charged just that they did seem like the type of people who would sort the mistake out... we had something similar at a different restaurant where our bill had been added up wrong by 10tl and they could not have been more sorry and soon rectified it, also they had left a beer off which I am sure we could have "got away" with but somehow it did not seem right to do this so we told them about the missed off beer....