Regional airport... but many of the replies allude to CAS, which a lot of those fields do not enjoy? Are you talking UK (you'd be amazed how different the rules can be, and must take that into account when reading any replies!)
Overlooking CAS, in unregulated airspace a visual approach should IMHO count as a VFR procedure... under which the pilot is, not only responsible for terrain clearance and separation from other VFR traffic? A restriction on a VFR approach (as quoted) might be to ensure separation on IFR traffic in the vacinity, as well as noise abatement etc etc?