In message , David of Broadway
writes

(I'm ignoring day Travelcards, which, if I understand correctly, will
be phased out once Oyster deployment is complete.)

I can't back this up but from my experience in the London tourist trade
the vast majority of visitors to London use a combination of Day
Travelcards. It often surprises people how short some visitor's stays in
London are, 1 - 3 days being by no means unusual.

(See another recent thread for the interminable saga of what happened
when I "tried out" an explanation of oyster PAYG to a group from another
part of England!)

--
Ian Jelf, MITG
Birmingham, UK

Registered Blue Badge Tourist Guide for London and the Heart of England
http://www.bluebadge.demon.co.uk