NSW is pretty big, you can probably fit the UK in it. There is plenty of good riding, but its spread out. Check out Tartha its awesome, ride in the morning and chill on the beach in the afternoon.
I live in Canberra, ACT, moved from Worcestershire in 2014.
Riding here is pretty good, but is very XC based, seems the trail builders are scared of jumps and other features, except for at Stromlo.
Check out theberm.com.au and have a look at Kowen, Sparrow Hill, Stromlo, Bruce Ridge, Majura and even Tuggeranong Pines for a bit of freeride fun.