Possible Locations

I have a few ideas about where to go for my urban exploration part of the project. My brother told me of a place near the Pantiles in Tunbridge Wells where an old train tunnel has over grown and been abandoned. I looked into this and found this article:
http://anke.blogs.com/anke/2010/10/way-out-west.html

The images show the tunnel in 1986:

Im going to look into the accessability of the tunnel and possibly look at trying to get close enough to take some decent photographs. As the photograph was taken more than 20 years ago I would have thought it would be a lot more over grown than this and may fit in with a concluding part of the project exploring natures reversal and taking back the land it had before.