Looking for Cookes of Middlesex England

I am looking for any relatives of Isaac William Henry Cooke a cabinet maker from St. Pancras Middlesex. His wifes name was Gertrude Marion, her maiden name was smith. They had a daughter her name was Florence Marion born in 1881. Florence came to australia not sure if that was on her own or with family. I have been told she may have had a sister who went to America. I have not been able to find this family on any of the census. Florence is my grandmother.
Kay Edgar