In message , David Walters
writes
Allegedly a maximum cost single will be deducted and then some credit
will be put back on at the end of your journey.

So what happens if the ticket gates are working at the start of your
journey but not at the end of your journey?
Surely it would better to take off a minimum cost single. And then take
the extra off at the end?
You don't want to overcharge people or nowt..........
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CJG