Whilst checking the Swaby name site, I found your posting.
My grandfather on my mums side was Joseph Swaby, greengrocer of Bethnal Green. I know he had a shop in Green St, B/Green. I will check my tree, I belive Joe was Sids brother ?? I also know of my uncle Billy. I have a photo that Siddy sent home whilst he was in the army, in Italy I think, also of the boys working on the veg stall in Roman Road street market. Is this the same person ? Please e-mail me and compare facts.