Pingle wrote to uk.transport.london on Sat, 21 May 2005:

A one-day bus pass is £3.00. Not too bad, perhaps, but that's still £15.00 a
week if you use if every weekday.

So if you think you're going to, you buy a weekly bus pass for £11.00,
saving £4.00. Or a monthly one for £42.30, saving even more - and in
both cases you can use buses to your heart's content, and trams, and at
weekends....

I usually buy a monthly bus pass simply for the convenience!
--
"Mrs Redboots"
http://www.amsmyth.demon.co.uk/
Website updated 3 April 2005