London Borough of Islington done now. I may go and revisit the Crouch End area again at some point because I wasn't 100% satisfied with my survey there, but it's good enough.

As if to make up for this complexity, the border after this was easy: Hornsey Lane/Dartmouth Park Road/Brecknock Road/York Way, from Hornsey to King's Cross without really needing to turn.

So, that's 5 out of 33 boroughs!