This UNOFFICIAL website is about the mountain biking trails at Sherwood Pines in Nottinghamshire.
For official information please contact the Forestry Commission

Apparently visitor numbers are up
The downhill bits are off camber, the flat bits are muddy and the uphill bits, well they're uphill. Its unlikely that you will get much flow with current trail conditions.
Car park gates now close at 6pm. Shop is open Wednesdays until 8pm £30 to get you car released if you get locked in.
here's a couple of recent videos I've found on youtube
http://www.youtube.com/watch?v=LDKSqKwfyrY
http://www.youtube.com/watch?v=XQ3dti92ABU
Here is the BBC update on the dog deaths.