Rob I have an awful feeling that you actually dont connect to James William Ruston and Polly aka Mary Ann Cole...well not via Eliza J Ruston.
I have been having a look and on the 1901 census you have James William Rustona and Mary ann (polly) Cole with a "Lizzie" Ruston.
Now on bmsgh there is a Lizzie Ruston b 1897 so that one is her.
Then you have an Eliza J Ruston regis 1897 and that one I bet is yours and your line.
Because I think that your Eliza J had parents Joseph Woodward and Maria Ruston.
They married in Sept qtr 1897 as Jimmy flagged
Marriages
Sep 1897 RUSTON Maria Dudley 6c 97
Woodward Joseph Dudley 6c 97
Births
Jun 1897 Ruston Eliza Jane Dudley 6c 94
So Eliza was born out of wedlock it would seem and so registered in her mothers name of Ruston.
You say that you have seen the marriage cert but I wonder if the surname is actually Woodward for father I think it is worth buying that.
Or getting a look up done
It is so easy to see the name of the bride and the fathers first name without looking at the surname.
how did you come to the conclusion that James William was the father for your Eliza?
What are the names that you know of of your Eliza J sisters...do you know for deffo that Lily is a sister....or names of Elizas brothers that you know for fact.
Dont delete anything on connections thought cos the info going back is sound it is just a query now on Eliza and her line