The photo was taken by the crash gate on the south side of the airport. See
http://www.btinternet.com/~dougbex/Spotters.htm and scroll down to the map of outside the airport. The position is marked as "A". Click on the letter “A” in the index for a detailed report of the location and how to get there.
There is a photo gallery of LTN at
http://doug3658.fotopic.net/