I was doing a check ride in Algeria the other day when I was taken back to my time in Nigeria.
What it was, it was CAVOK and we were trying to get in one precision approach, when the Glide Slope was up but the localiser was down. So, being the Total Aviation Professional that I am, we did a Precision NDB Approach, ADF-tracking the beacon signal and following the G/S. Fairly harmless fun, I think you will agree....
What it used to be, at Lagos or Abuja, I really cannot remember which, was doing that for real in thick harmattan, using the VOR for lateral and the G/S for vertical, when ATC had cleared us all for the ILS after advising us that the Localiser had been reported U/S, as in "Localiser out of service, cleared for ILS approach Runway (whatever)." You really could not make that up!
Perhaps they have tightened up a bit since those days? Or perhaps not. Just let me guess; do not bother to tell me which it is.