Agree with the sentiments above in regard to seat belt signs being left on for the duration of the flight. Experienced it as SLF on a flight HK - LHR last year, then again on the return leg. When you gotta go, you gotta go. Told cabin crew they would have a nasty mess to clean up if they prevented my excursion to the little boys' room. They didn't argue.
Left me unimpressed with the carrier. Will avoid them in the future, if I can. That's how you lose repeat business.
Le Vieux