On Tue, 24 Oct 2006 20:42:22 +0100, Dave Newt
wrote:

Having said all that, there are plenty of corridors and stairs on LUL
that don't say "Keep Left" and some which actually say "Keep Right".

Keep Rights tend to be because the arrangement of the passageways
means keeping left would lead to conflicting streams of pedestrians.
Green Park springs to mind...