I also shouted at the TV at the assumption regarding Rosa's parentage! They never bothered to find out anything about Rosa's mother - in my family it was always the mother's mother who took in the illegitimate children. (happened frequently

) Even more likely to be one of the daughters' children if they were 'working' in their mother's house of ill-repute.

I'm afraid I found this episode a bit long-drawn-out, with Alex reading everything out v-e-r-y slowly when she quite obviously was reading from the typed transcript which could be seen next to the original.
The information was interesting but I felt it could have been done in half an hour and they could have actually got more in. I'm sure in earlier series they covered more ground in each episode.
Still I fell asleep 10 minutes before the end, maybe it livened up then

but OH did fill me in what I missed.