I agree not seen anything in the bike mags
Issue was covered in MCN quite extensivly some time ago. I think that most people had expected a sensible approach as only 5% of tracks allow motor vehicles anyway. The ban has come as a surprise to most people.
As has been said elsewhere, will not stop the people causing the problem, they will carry on being prats, once again it is only going to effect law abiding citizens
Run over a rambler today, it will make you feel better