To create a Future Approved Leave for every bank holiday, go to:
Time off types (x) Manage
Choose a Leave Type
Make sure the leave type you're editing is for the staff you want to be affected by this rule - check the tags.
Go to section 3 - Balance Configuration
Enable the Create future approved time-off for Bank Holidays option.
With this setting, every staff member that this leave type applies to, will have a leave request automatically created on every bank holiday.
Likewise, if you have this setup, and you want to remove it for certain staff members, you can enter a leave type and disable the Create future approved time-off for Bank Holidays option.