today i continued my solo circumnavigation of the london borough of hackney. i picked up the segment of the Islington/Hackney border down to old street that i'd missed; then walked along the border down to Sun Street, where it meets the City. The Hackney/Tower Hamlets border was quite tricky in comparison: especially confusing bits were the course in the Shoreditch High Street/Commercial Street/Bethal Green Road, what it does around Haggerston Park, and also at Hackney Wick. But hopefully my deductions aren't too wrong.
the remaining section is the border with Haringey, east from Manor House, then south down the Lee to Hackney Wick again.