briefly and sort of correctly.
Cranham is owned by a number of private individuals/organisations, some is managed by NE, some isn’t. Some of these owners either tolerate or allow cycling, some don’t. some are definitely anti bike.
A compromise was arrived at early last year that allowed bikes to use a limited number of tracks, not as many as were being used. A number of tracks are definitely closed, a number are outside the agreement area and the ban area.
A bloke, who looks a bit like Jim Bowen was putting branches, nails and various other crap on the tracks, best guess to stop bikes, but obviously no regard to the injuries that could be suffered by dogs, horses, deer etc. This was a couple of years ago but you never know.
Worst case is Popes Wood, lots of building went on, and i think some very unhappy owners!!!
Most of the bike trails are not used by horses but the trails do cross horse trails, so as i said use your head.
If you need more specific details about where you can ride, ask.