Could it be possible that the episode titles were scrapped towards the end of the last few months of post-production editing? I'd be interested to know why they were scrapped. Also, is the BBC publicist not the most accurate source of information there is? I do hope that this is all a bit of confusion and next Saturday will see the episode have a title, as like you have said: episodes 5 and 6 have titles. Finally, does this mean we should prepare for Holby City to have its episode titles scrapped after, or even before, the conclusion of Series 19 too?