I think there’s a group that go from the bridge or golf course on saturday (Bristol tail group maybe?) and a week night too.
The Uni goes Thursday at 2pm and saturday at 10pm from the east side of the bridge (in term time). I just left but they’re all pretty accommodating if you ask when you rock up if its okay to ride with them.
Other option is go off Strava.
Good trails in Leigh are picnic bench, knicker, Rocky horror, s**t tent and happy camper. Once you’re on those you’ll see plenty that you’ll just have to push up to find the top.
Belmont again is good, just lend a hand when you see the guys there or go to a dig day. I can’t hit most of the jumps but still plenty of fun to be had.
Some stuff to go at in bourton combe and wraxall piece too – have a bit of an explore!