On 7 Feb, 18:47, lonelytraveller
wrote:
So you are saying the first leg of that corridor is aligned approx "4
O'clock" from the ticket office (ie parallel to the Victoria Line
escalators? It feels to me more like "2 o'clock", but it's easy to get
disorientated under ground.

http://planningonline.camden.gov.uk/...g-2085745.pdf?...

I've just noticed that the same diagram (page 5) also shows the old
northern line lift shafts and (spiral) emergency stairs - just west of
the junction between the tunnel-thats-just-been-closed and the tunnel-
that-will-be-open-next-year.

Page 11 also seems to indicate that the "round thing" at the top of
the disused picadilly lift shafts is now used as a "supply/extract
duct" and "draft relief for the Victoria Line".