Joao - we can't discuss this at length because it is off-topic, but this is one of the very rare times on this forum where I am 'qualified' to answer.
However, a faulty product does not imply negligence in every case, does it?
No, I never said it did, but I suspect you are forgetting about product liability, whereby manufacturers are strictly liable (i.e. automatically negligent) for their faulty products. That's another story, though.
You said Tesco, not the manufacturer, is liable. I pointed out that that is not correct in law. However, you rightly point out that the party you seek compensation from is not always the party at fault. Let's leave it at that.
Skipness One Echo - am I correct in thinking that only "one" of the runways is ILS-equipped?