I posted on the london.pm mailing list last night about a script I'd used to suck the Tube station zones out of the Wikimedia Commons Tube data and add them to the Randomness Guide to London. I thought maybe OGL might be interested in this too, so I'm attaching the script to this email. The datafile is at http://commons.wikimedia.org/wiki/London_Underground_geographic_maps/CSV
Obviously the script will need a bit of tweaking, but if you want it, here it is. It should also be easy enough to modify it to add location and line data as well (that's in the datafile too, but I already had that data so didn't bother). I probably don't need to mention that it would be wise to run the script against a test guide before running it against the live instance.
Let me know if anything in the script is overly confusing; I didn't really comment it much because it was a one-off.
Kake