Dartmouth Park Hill isn't a fuzzy edge. It's the exact line between Camden and Islington.

Dartmouth Park

A conservation area whose own boundary statement names the exact road that splits two boroughs.

The Dartmouth Park Conservation Area statement describes an area running from Swains Lane in the north, including Holly Village, down to the railway line towards Gospel Oak in the south, with Dartmouth Park Hill itself forming the conservation area's eastern edge and, at the same time, the borough boundary with Islington. That is an unusual thing for a single road to be doing, and it means a business address here is never just a postcode - it's a specific side of a specific hill.

Holly Village, a distinctive Gothic Revival estate near Highgate Cemetery, sits inside the Camden side of that boundary, as does Swains Lane at the foot of Highgate West Hill. Neither Swains Lane nor the small pocket of shops at the Chetwynd Road and York Rise junction amounts to a high street - both are honestly small, and a website should describe them as pockets, not parades. What trades here is largely home-based professionals, architects, surveyors and property trades working on Victorian and Edwardian conservation-area housing, rather than shopfronts.

No figure exists for how much of Dartmouth Park actually sits in Camden versus Islington, and none should be claimed - the honest fact is the boundary itself, not a proportion either side of it. What a website can do, and what a shared borough name can't, is say plainly which side of Dartmouth Park Hill a business trades on, so a customer working out which council or which area they're dealing with gets an answer instead of a guess.