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Having had a look at the additional information you sent directly to me I can now say that our records do link back from your Mother and Uncle Maurice back to Walter David and Elizabeth Nash and extend further back in time from them. Other initials we had recorded just obscured the path!
By implication you suggest that you have looked on the Ancestry.com site for a Walter David Bunton marriage and confirmed that the detail ties in with that for Elizabeth Nash in Jun 1901. At that period of time our records from the GRO did not show who was the spouse. As the Registration District where the marriage took place is West Ham, which contains many churches, it looks as though you are going to have buy the certificate in order to locate the church.The certificate hopefully will give you additional clues about Elizabeth's Father. Church Banns and its Marriage Register each may help you to find out where and with whom she lived. Wait and see if your Uncle can give you some clues first but eventually I think you will have to spend some money to progress. Michael.