In message
, at
04:40:04 on Thu, 27 Dec 2012, 77002 remarked:
I suspect that the long route from the Victoria and Piccadilly
lines to the northern ticket hall is a safety issue.

Given that the Northern Ticket Hall is where it is, there's not really a
shorter route to the Piccadilly Line under platform 0. The Victoria Line
is beyond, and because it's re-using the foot tunnel from the old
KX-Thameslink entrance the access to the platforms is excessively to the
east. http://www.perry.co.uk/images/kx-composite.jpg

(Picture dates from about four years ago, before any of the new works
were open, but it turns out is quite close to reality).

The "missing link" is from the south of the new Thameslink platforms[1]
to the Northern Line, but the Fleet River duct is the usual excuse.

[1] not pictured, but underneath the legend on the western edge of StP.
--
Roland Perry