It seems the latest set of OSIs (Out of Station Interchanges] is
referenced from
http://www.whatdotheyknow.com/request/new_out_of_station_interchanges
contains a link to
http://www.whatdotheyknow.com/reques...34/attach/3/OS
I%20Report%20May2011FR%20V2%2017012011.xls

That file refers to stations by NLC and name. e.g.
A A_Name B B_Name TimeAB TimeBA
580 Finsbury Park 6119 Finsbury Park 10 10
I believe that line should be
580 Finsbury Park 6119 Finsbury Park NR 10 10

[I've renamed the columns to fit in 72 characters]
What does NLC expand to?
Where can I find a set of them on the net?

There is a friendlier presentation of the information at
http://www.oyster-rail.org.uk/out-of-station-interchange-osi/
--
Walter Briscoe