Before this thead goes completely haywire:
Does the situation described really merit an MOR? In any case, all such reports - and those submitted in accordance with AMC 20-8 (see 2042 Annexe 1 Part M) - should be reported within 72 hours of becoming aware of the circumstances.
If the flight was operated by KLM UK the Netherlands CAA is out of the picture.
I thought KLM uk had been subsumed by KLM; all their aircraft are PH-registered.
Frankly, all talk of occurrence reports is tosh.
