Lee quarry is a great place to go as it has everything you need as a mountain biker. And now there is a team who are repairing all the trails, improving them and potentially adding new trails, why go anywhere else.
Great climbs
Lots of technical trails both climbing and decending
Lots of flowing decends too.
Also you can pair it with cragg quarry.
No facilities (yet)
yes
Check out the full trail description: Lee Quarry and Cragg Quarry Mountain Biking