In message
of
Sun, 21 Sep 2008 15:57:13 in uk.transport.london, Mizter T
writes
[snip]
(And I'm pretty sure that Marylebone NR and Baker Street LU are tied
together as being a valid OOSI, and I think this is also the case with
regards to Fenchurch Street NR and Tower Hill LU - though annoyingly
Paddington NR and Lancaster Gate LU is not an OOSI.)

Both true. As is Euston Square and Euston but not ES and Warren Street.
I've just been through to LU customer services and got one of the more
helpful members of their staff. They will try to assemble a list of
those interchanges. If they do, I will forward here.
--
Walter Briscoe