A full Brittania 767 gatwick to New Zealand in a seat 4 inches narrower than I am, next to the toilets. 3 stops and about 30 hours elapsed time. No sleep. Never did work out the real reason for having to take the hand baggage each time we left the Aircraft. Crew and Aircraft OK, just no room. Would go on a one sector flight with them but unless you are small or get the few big seats at the front of the cabin-no further. Took about a week to recover.