In message , at 14:31:45 on
Mon, 14 Jan 2013, David Walters remarked:
davros.org lists Marble Arch as having a fixed stairway.

That confirms my recollection (a stairway alongside one of the
escalators, but not at the same angle so it's succession of half a dozen
steps, landing etc)

Which I assume
is why it isn't on the geofftech page as accessible only be escalator.

It's not on his list of "with steps", on the other hand neither is it on
the list of "only escalators". As we can probably agree it doesn't have
lifts, that's where the Venn-foo I mentioned comes in.

Maybe the list you need is the inverse of the "only escalator" one
(assuming lifts are either OK, or always accompanied by stairs).
--
Roland Perry