wow, you are so clever.
All addresses seem to be in the area that my father in law lived (unfortunately, every street has now been demolished).
Right in the centre of Newcastle, and even though Oystershell lane sounds quaint, believe me I don't think it would have been. Newcastle Breweries was actually built over Oystershell Lane, and now a good bit of this is demolished and being redeveloped as the "science city".
It's lovely when, even though not confirmed, it seems to fall into place with the flower seller theme, as the family is definitely linked with the flower/vegetable market (again demolished) in Newcastle.
I've just found some old environmental health photos of Seaham Street
http://www.flickr.com/photos/newcastlelibraries/page229/Lovely eh. Mind looking at the rest of the photos makes Newcastle out to be a lovely place!!
Thanks again.
Neale