This is an interesting document. Let me draw your attention to paragraph 3:

3. Decide whether you want to stop use and whether this is possible
The flow chart on page 7 will help you to make you decision. Again this offers some solutions. There is no point bulldozing a course that you know will be rebuilt the following week.

I thought that was really interesting. Just as we think that there is no point in building once a site has been plowed the people who might arrange plowing think that there’s no point in doing it if we will just rebuild. They are worried about driving the situation more underground and not being able to control it. So if your trails are on forestry commission land, and they get plowed, go and build them again.