You arent wrong starvin.
I had to look into that incident, as the airline i work for flies into Ireland, and prepare a precautionary warning for our pilots, there were quite a few errors in that incident, and failures on quite a few parts, without going into a lot of technical details, the Instument landing system was being calibrated at Derry Airport, at the exact moment the flight was landing! The pilot, and the air traffic controllers, plus the crew who were in the calibration aircraft were all deemed at fault. The runway at derry and the one at Ballykelly where he actually landed at are aligned almost exactly, the pilot, and atc didnt realise he was in the wrong place until he hit the ground, and managed to stop just in front of a railway line.