Starting from Cricklewood, I managed to get a reasonable attempt at the Barnet/Camden border. The border here is quite different to other sections of border I've mapped, in that it rarely, if ever, seems to follow roads, instead apparently preferring to follow the line dividing people's back gardens. Tomorrow I'll go for a walk around Maida Vale, and should be able to finish off the Camden polygon.

Using the nifty new Zappy service, I discovered that someone had already added borders representing Kent to the database. As these were traced from the NPE map, however, this includes the old County of London/Kent border rather than the post-1965 Greater London/Kent boundary. The old County of London/Kent border is now the Greenwich/Bexley and Lewisham/Bromley border, so this is still pretty useful.