Hi Susan
You say Fanny re-married, do you have that cert or is it what you know from the family descendants.In the 1881 census the family were together, in 1884 Fanny Warner had re-married. In 1884 Fanny has moved from Long Crendon back to Chelsea (where she was born).
I searched all the marriages between 1881 and 1884 for Fanny Warner remarrying and through another researcher discovered that she had re-married using the name Fanny Brown. I have the marriage certificate. I researched the marriages to see if Fanny Warner had married a BROWN between 1881-1884 but she hadn't.
Through the same researcher who is related to the Warners we discovered that the 2 daughters on marrying used the surname BROWN declaring their father as James Brown.
I believe that George Warner left Fanny, I don't think there will have been a divorce but I will try your suggestion thank you...........perhaps the shame? caused her to re-marry using a different surname?
thanks for your help and sorry for taking so long in replying I have just got back from my jolly holidays

thanks and regards
Sarah