What are these Natural trails you speak off?
So start from the top (Tower) was called Personal hygiene - it was mullered from years of use, the new part of this is far better now. It stopped at the bridle track. From here it's been extended all the way down to the crossroads.
Next bit, near the Landslip track - nothing used ot exists in there bar a quick cut through, so the "uphill" bit has actually gained you something decent to ride on other that the bridlepaths.
Next Bit, into the old (I think it was called) Moonbase - this was also mullered and no fun to ride in the wet. The track through there now is ver good, with some decent airtime to be had.
Then out to the Cricket pitch, into the old "Filbert Street massacre", that too was mullered, and nothing like it used to be, again new trail, loads of improvement.
Then into what you would've know as Roller Coaster - this hasn't exactly changed much with the exception of some hardcore going down.
So I fail to see exactly where the trails have been sanitised or not improved. it all flows a lot better than it used to.