I am researching the my daughter-in-law's family and Rosannah is her great (x2) grandmother. I knew that Mary Ann YARNOLD had married William STRINGER but I had not concluded that William was the father of Rosannah. I was very interested to read the notes on BCC and to see that a missing link for Jan (Note 16/5/16) was a birth certificate.
I do have one and the details are:
Births, Dudley, sub-district Rowley Regis, reg 13/2/1867/ No. 460
Date and place - 14/1/1867, Cradley Heath Rowley Regis; Rosannah; Girl; Father -blank; Mother - Mary Ann YARNOLD; Occ of father - blank; Informant - The mark of Mary Ann YARNOLD Mother Cradley Heath Rowley Regis.
I am not sure if this helps! Re the other information on BCC, I am surprised that William and Mary Ann cannot be found on the 1871 Census.
I have information on the ancestors of Rosannah's husband Albert FOWKES, if anyone is interested.