I think your only option is try and negotiate to buy the track. If this fails, I'm afraid your stuck with the present situation. If I were owner, I wouldn't want to fence the track, as it'll be starting off on the long road to losing ownership. As has been said above if fenced the owner could lose SFP payments too ( although I don't think tracks should be claimed on anyway). Also I wouldn't want to spend money on hardcore / gates / fences / grids either. What benefit would it be to the owner ?