The walking route from one end of Islington Tunnel to the other has to be over the top, as there is no towpath. It is not at all direct, using many streets, and not very well signed. This path probably is the best walking route at first, but it was not signed, although a road route round this estate was. The signed route was probably for cycles.
TQ3083 : King's Cross station An interesting picture from an interesting vantage point. You weren't there by accident as I believe there's been no unofficial access for many, many years. The foreground detailing is excellent.