Phil Clark wrote:

I fit a half hour walk from Waterloo to Green Park into my schedule
(and back again in the evening). I reckon I get an hour's exercise a
day for the net expenditure of around half that - I have to allow 20
minutes on the way home for the tube; walking, 35 minutes gets me
there easily.

Fair enough - looks like that works for you. I used to walk to work
when I lived about 2.5 miles from it; now I work further away (about
5.5 miles) I cycle or drive instead, as to walk would take something
like an hour and a half each way, which is a little excessive.

Central London traffic isn't *that* bad on a bike, as you can usually
go faster than the rest of it, so speed isn't as much of a threat as it
is elsewhere. However, I can see why walking would be preferable, as
you do still need your wits about you!

Neil