In message , at 10:50:54 on Sun, 12 Dec
2010, Clive Page remarked:

Fortunately there are now lifts to almost all points (maybe all).

Yes, all of them.

Unfortunately the shortest level route in some cases, such as that
between the Northern Line and the Thameslink station, would involve
using no fewer than five lifts, as far as I could see.

You can do it in three/four: One from platform to gate level. A second
from gate level to street, and then one or two back down to the
Thameslink platforms.

Finding the shortest route to the appropriate lift in each case
can't be easy.

The only choices (for any of the accessible routes) are how you get from
Street to "-1".
--
Roland Perry