I think it's distance from the centroid of the postcode sector.
The people in those houses will be shopping at those shops? It's not about house to house spread.
@Chalfie started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
I think it's distance from the centroid of the postcode sector.
The people in those houses will be shopping at those shops? It's not about house to house spread.