Here's some more research

http://www.tfl.gov.uk/

http://current.newsweek.com/budgettravel/2008/08/london_huge_new_train_system_g.html

http://www.slowtrav.com/uk/london/transportation.htm

http://www.visitbritain.fi/travel-and-transport/travel-around-britain/london-transport/

http://www.ukstudentlife.com/Travel/Transport/London/Underground.htm

http://www.nationalrail.co.uk/system/galleries/download/print_maps/LondonConnections.pdf

http://www.nationalrail.co.uk/tocs_maps/maps/

http://en.wikipedia.org/wiki/Westminster_tube_station

http://en.wikipedia.org/wiki/London_Underground

http://www.metazone.co.uk/

http://www.abandonedstations.org.uk/

http://underground-history.co.uk/front.php

http://en.wikipedia.org/wiki/List_of_places_in_London

Here’s a map:
http://www.inetours.com/England/London/pages/London_Map.html