Now here's an interesting thought, for you holding an FAA license. When you fly in the US, why not send a NASA form for fatigue or whatever. You still have an FAA license and if anything should happen in the US, perhaps your FAA ticket could be in jeopordy. NASA forms are a free "vehicle" to report stuff to the FAA (excluding violations etc.). You of course are operating under the GCAA license, but hey, crazier things have happened. Probably nothing would or could happen to your ticket, but what do you have to lose by submitting the NASA's.