On Nov 10, 12:08*am, MIG wrote:

On Nov 7, 12:34*am, wrote:
[snip]
You asked and they assured you it was an OSI. Seems good
enough to me.

I've since had a reply confirming that it isn't an OSI after all after
all. *The issue is apparently with the tool which they use to inform
them of the situation at specific stations, eg OSI or pink validators,
on the basis of which they misinformed me. *(I wonder if this relates
to the previous Bank escalator situation?)

TfL is reviewing the situation and Cannon Street to Bank could be
introduced as an OSI in future if there is an agreement with the NR
company. *However, for now, it definitely isn't.

I think that it definitely should be, given the much greater distances
over which OSIs do apply, and given that it's such a useful through
route (compared with Waterloo to Embankment, which is an OSI).

Because I was misinformed, I am being offered a refund of £1.40 (I
thought it was £0.70), but only the once, and it will continue to
charge for separate journeys if I go that way again.

Glad to hear there's been a resolution to this mystery - and that TfL
(specifically Oyster CS) owned up to getting it wrong first time round
and seemingly apologised for that.

I agree that a Cannon Street NR to Bank LU OSI would be a Good Thing
(whilst I suppose at the same time acknowledging that more OSIs
provide more opportunities for OSI related time-out issues) - as has
been discussed many times before, this interchange is a great way of
getting from points south east to the west end or indeed wherever on
the Central line.

(And perhaps you're onto something w.r.t. the (mis)info they gave you
and the Bank escalator situation as was, though without scratching my
head for a bit I can't quite think how such a befuddlement might pan
out.)