Fionn,
You mention "us passengers", so I am taking it you are not a pilot/flying organisation operator.
So, first thing: listen to what the AOC holder tells you. There may be specifics to that aircraft/airfield that are critical.
Second. Never mention airSICKness! Always use phrases such as: if you feel any discomfort.... Say a word and people start to think about it! Once they think about it, you are down that slippery slope!
Third: CAA have a Safety Sense leaflet: Care of Passengers
https://www.caa.co.uk/docs/33/20130121SSL02.pdf
well worth a read.