Here's a map showing where it's quicker to walk: http://rodcorp.typepad.com/rodcorp/2003/10/london_tube_map.html http://rodcorp.typepad.com/rodcorp/2003/10/lond

Here's a map showing where it's quicker to walk: http://rodcorp.typepad.com/rodcorp/2003/10/london_tube_map.html http://rodcorp.typepad.com/rodcorp/2003/10/london_tube_map.h...