Thankyou, everyone for your wonderful replies ...

Rachel Thompson (nee Bowles) died, aged 42, Derby 4Q 1876.
I'm not sure why I had so much trouble finding the Thompsons, I guess it was because they moved from their birth area to Dronfield. Mary Ann Thompson had a ~1 year old child (Florence) at the time of her marriage to William Bradley, in Dronfield. Until I obtained the marriage certificate, I was thinking "Thompson" was from a previous marriage, there were lots of possibilities! Florence was obviously "illegitimate". There were at least 4 possible Mary Ann births in the Peterborough District and 3 possible Florence births in Dronfield.
Harriet Thompson (I now know to be Mary Ann's younger sister) is listed as a witness to her marriage to William Bradley.
Again, many thanks, it all seems to be sorted ...
