Accessibility to services and transport facilities on foot is a key consideration to transport planning professionals and for sustainable development in general.
Transport for London has recently made two interesting/useful maps available online.
http://content.tfl.gov.uk/walking-tube-map.pdf
http://content.tfl.gov.uk/london-connections-map.pdf
This mapping should aide planning professionals’ decision making and general travellers’ travel planning/route and mode choices.