Really sensibile Old clay, hope they 'stay orf yer land'.
It's interesting to read about this, I'm really fortunate to have ground in an isolated area and difficult to access area.
We don't have signs or padlock any gates, although the area is fenced off for the stock. Our land actually has an ancient right of way straight through it, however this currently appears to be an unknown, although I have had to chase down off roaders twice, to tell them, 'get off my land'... cheeky people started aruing with me too. (they wouldn't of got far because the way they were going can barely fit a small quadbike anyways)