Hi there. Thank you both. Walter is my 8x great grandfather. The second Ann being my seven times great grandmother. i didn't have the siblings and must have been tired as didn't notice the mother's name either! However, somewhere in between the five children that I've now found, (Harry 1712 and Ellen 1713) they move to hare street, which is now called main road in gidea park. This is quite close to Harold wood, (or maybe they were at the Harold wood end of it) so I'm going to have a hunt round Noak hill, havering attebower and warley for marriages for Walter and Ellen.
As to the c1690, it was working back from his children's births. Unlikely to have been born after 1690, but could've been earlier.