Paul Corfield wrote:

I ended up with a very peculiar double charge last weekend. I was
travelling from West Croydon to Stratford via Canada Water. I have a
Z23 Travelcard so expected to get a 2 zone extension charge which was
duly deducted at Stratford. I popped into Westfield and was in time
to get the GA train to T Hale. That is within the availability on my
ticket so no charge should have been made.

However on checking my Oyster account I saw a second charge made on
exit from T Hale. I have had a refund after a chat with the Oyster
help line. The bizarre thing is that the system joined the two
journeys together despite Stratford not being an OSI and then
proceeded to charge me as if I've gone via Zone 1 so it also ignored
the pink validator touch at Canada Water. Even sillier is that there
is an alternative fare for West Croydon to T Hale (NR) via Canada
Water which is the same fare as Stratford.

I have allowed the help line to send the journey details from my
account to the Oyster team so they investigate whatever Gremlin there
is the system that can join journeys together where there is no OSI
and where there is a valid non Z1 fare in the system!

Maybe it is a legacy of the days when the Jubilee line had a separate
gateline and therefore Stratford was an OSI of sorts?

Peter Smyth