I didn't know that that was where the Lea rose. That makes it the place where the Danelagh boundary left Watling Street to go east along the river, doesn't it?

And a separate aside: I was looking up legends about the Milky Way for a Children's University astronomy class, and it gave a Saxon name for it as Watling Street. I don't know the source for this, and its derivation from a mythological king, but it's an interesting and romantic thought for those of us living alongside it.