Adherence to CDAs is measured by British Airports Authority (using data supplied from NATS radars). I believe the system is called GEMS.
I believe that non-adherence to CDAs results in letters being sent to the airlines to enquire why.....certainly persistent offenders are notified
RNAV Approaches are being introduced at some European airfields where traffic density permits. These approaches incorporate a 3D profile, containing a CDA, which is flown by the FMS when in the appropriate autopilot mode.