First of all, there are always plenty of opportunities on a trip, if it's to France they'll be on a plane and they'll be a toliet. Even if it's a coach journey, they normally stop and also they'll all go beforehand as well. A trip isn't every day, it will be once in a while, and for a short period of time. We don't apply situations which are occasional to set the judgements for every day. You're just trying to use one situation to say that that means that should be replicated in lesson, evem when it's in a different environment. If you read by other posts, you'll see the points which I care much more about, rather than just pontificating on one thing which is an occasional event.
I'd say that yes a dead child is bad (to be honest, kids have gone to the toliet on a coach in my experience but yes I understand the risk), so even if they weren't allowed, I'd day the effect on a child (particularly girls as new research is showing links with rises of 275% in girls absences, not just this obviously), if they bleed through, soil themselves, or feel so anxious about lessons they don't come to school, or don't do the work, is also incredibly bad, not just exposing them to easy bullying (when we already known girls feel shame around periods and endure jokes from boys around them), but also the personal effect on their wellbeing.
@SoMuchLego You say students are unreasonable to think 'why shouldn't I be uncomfortable', how is that unreasonable. They're already in lessons all day, have lots of homework and tests, more than ever, and more kids than ever have issues (complicated families and mental health and so much more), why should they be uncomfortable? Any urologist will tell you it's bad for anyone to have to repeatdly hold their bladder, even if they can and aren't near peeing themselves, it's still bad. What life lesson are they learning from the discomfort. Yes there are times you can't go to the toilet in life, but few and far between (expect teaching, we know). Like I mentioned before, its funny how because teachers can't go, the argument suddenly holds weight that students shouldn't have to also. But for basic jewelry, or painted nails, the argument that teachers can so why can't students, is deemed as stupid.
@Endlesswandering 'Maybe toilets with a one in one out door policy (students scan their student card to get in?'
I actually think (if schools had more money) this would be a great idea, using smart card and tech. But that will have to wait till schools have so much money they don't know what to do with all of it, which is definitely not anytime soon with how stretched school budgets are.