In message , at
22:05:07 on Sun, 31 Aug 2008, mert1639
remarked:
, at It
depends whether the ticket inspector thinks its deliberate fare evasion or
not. If so, he's quite likely to demand ID (and I believe can call in the
BTP to make sure he gets it). If he thinks it's a customer being stupid,
then depending on the local rules he'll either charge a penalty fare, or
sell a completely new "highest price" ticket. The traveller will *not* be
given an allowance for trading-in the 'invalid' ticket.
They'd both have a long wait then seeing as there's no obligation to carry
any form of ID.

aiui the procedure would be to haul an non-cooperating person off to a
quiet place and ask them sufficient questions to satisfy the officers
that they had established the correct identity. I suspect they are happy
to wait as long as that takes.
--
Roland Perry