No special access issues
Vall Bavona is reached by entering through Bignasco. It is a valley with infinite potential.
Keep in mind that many blocks are on private land. So if you are on private land and you see a local, always ask permission and be polite.
To clear new routes, see if you are on private land. Also Bavona is famous for its stone terraces built many years ago on top of the blocks, these terraces are archeological zones, so never remove the stones when clearing new boulder or climbing rout.