"Ianigsy" wrote

This is the sort of thing which puts me off having one- to put things
into perspective, I live in Yorkshire and travel down to London
probably twice a year on average. I like the idea of not having to
queue at Kings Cross for a Travelcard (especially as Trainline et al
only seem to be able to sell Z1-2 ones as add-ons) and buy another one
every morning. Trouble is, when I come down in about ten days' time,
I may need to go to Walthamstow on the Sunday and the Victoria Line's
closed, so I'll have to use One from Liverpool Street instead- so I'll
presumably need a paper one that day and half the object of getting
one is defeated.

Liverpool Street - Walthamstow Central is one (no pun intended) of the
National Rail routes on which Oyster PAYG is already accepted (though not at
intermediate stations).
http://www.tfl.gov.uk/tickets/oysteronline/5823.aspx
Peter