Any excuse for a bit of fancy dress. Walk to Work day on April 24th

Preaching to the converted maybe, but Living Streets have a website called
http://www.walkingworks.org.uk/

I actually walked all the way to Chalk Farm during some tube strikes (a few years back now). Took me a while but oddly I felt really good the rest of the day!
http://www.walkingworks.org.uk/content/national_walk_to_work_day.php

Or take a look at
http://www.walklondon.org.uk/

for ideas on more enjoyable strolls around London.