Thank you so much for the replies, I think you have indeed found them but I wonder why she is listed as Martha. I just double checked the certificates/census' that I do have to be certain.
My great grandad shows his parents as William Warren( Labourer) and his mother Elizabeth Warren nee Walker. He was born in 1896. Deptford Greenwich.
I then search for the marriage of William and Elizabeth, they were married at st johns deptford in 1892. She is listed as Elizabeth walker and him william warren. fathers William warren lighterman and Hers, charles walker carpenter.
On the 1911 census, its states they have been married for 22 years and that Daisey is 21. If daisey is 21 then she would have been born 1890, so I assume they are lying about when they got married as she appears to have already been born. He states he was born in deptford but previous census says Rotherhithe, she states plumstead so it appears that she is possibly Martha.
I will try the church registers as suggested...getting more flumoxed. As family folklore states that he was a well to do oil refiner too but the certificates show his "mark" rather than writing so I assume he wasnt so well to do although the certificates show labourer and the 1911 census shows oil refiner. But i'm certain im looking at the right certificates etc.