Don't think I was ever a passenger on NLH, but I am reminded of a flight Feb 1989, QF1 Melbourne to London on a non-Qantas aircraft.NLH-Never Leaves Home
The BA people didn’t think much of it either, which is presumably how it was available to be dumped on QF.
I was pleased to have never flown it.
I was rather chuffed getting an upgrade to F, but on boarding finding it a bit strange.
The 747-200 was (wet?) leased from Martinair.
The F seats were not up to the QF standard for the time, but I don't think that really qualifies as a "flight from hell".