On Sat, Jul 11, 2009 at 07:51:43AM -0500, Ulrich Neumann wrote:

I am thinking of staying in Watford for a couple of days to do some
sightseeing in London. So each morning/evening I will travel once
to/from London zone 1. During the day I will probably travel a lot
within zone 1/2.

...

[snip complicated dance]

The best ticket would be a normal Travelcard, it'll save a great deal of
faffing around for minimal extra cost.

--
David Cantrell | Minister for Arbitrary Justice

Planckton: n, the smallest possible living thing