Yeah there is a set of 2 specs in each direction limited at 50mph. Thats if its the one i think it is with all the roadworks which im pretty sure it is as its the only one on the m25 that i know of and that my origin goes nuts over with cameras.
110% none in the tunnel. Its great to hear my Tvr in there, There are the average speed ones on the way out though. I usally open it up in the tunnel and shut down and go slower to earn myself back some time i gained in the tunnel so the cameras dont get me.