In message , at 10:09:43
on Mon, 10 Dec 2018, David Cantrell remarked:

In truth it's one of the least important services to be affected by the
outage, which has the potential (in a future scenario) to ground half
the country's self-driving cars, or cause half of commuters to be unable
to use their m-ticketing application.

Those would be the same commuters who can't show their tickets when the
train is in the middle of ruralistan. A problem that I have literally
never heard of.

My own experience of using such things is that you always have the
option to download the ticket to your device.

Not if there's an O2 outage at the time you'd be wanting to download it.
And of course if you are one of the people who has been repeatedly
assured that the 'best' way to get a ticket is to buy it[1] via an App
while walking to the station... no O2, no ticket.

And of course as a result there's a queue out of the door for both the
rarely-open ticket window and the machines. The 1tph train is due in 5
minutes.

No doubt you'll now come up with some weird edge case, but in that case
I would assume that ticket inspectors would just wave people through if
they know that there's an outage.

"The computer[aka barrier] says no" is a common issue at places like
Kings Cross where the staff appear to be untrained at anything, and T&C
for m-ticketing and e-ticketing are riddled with "if the tech is broken,
then tough ****" messages.

[1] Or indeed your station parking.
--
Roland Perry