Originally Posted by Richard J.

So IF you can persuade the magistrate that you couldn't hear the reject
bleep AND you didn't see or understand the red light AND you didn't read
the text on the screen, even though you've been using Oyster on buses
for the last x years, AND you thought that you had enough credit on your
card, then you might be able to escape conviction.
--
Richard J.
(to e-mail me, swap uk and yon in address)