In message , at 11:02:05 on Thu, 27
Jun 2013, tim..... remarked:
But the sensible reason is that buses are crowded with commuters until
nearly 09:30, and have empty seats after that.

Not where I live. (outside of London)

Buses in Nottingham are very crowded in the rush hour, and twirlies on
trips to "tourist" destinations are reported to be filling up the
available buses leaving no room for paying (mainly local) passengers.
--
Roland Perry