I keep getting told off for this.
I pick almost 4yo DD up from preschool at 2:55pm (really more like 2:58pm), school-age DS gets let out at about 3:02 pm. We are almost always late to pick him up; I just can't get over any faster. I try to remember to take DD to the toilet before leaving preschool, but means I'll be even later to pick up DS1, and she often refuses to go or needs only a wee just then.
2 minutes after DS1 gets released, DD almost invariably needs a "big job", which she can't really clean up by herself; I need to go in with her.
We can't use Staff Toilets (Staf only, even out of hours not be used by others)
I can't go into little ones toilets (KS1) area -- they have decided it's a health & safety issue (we adults might be pervies). School would be ok if I sent her in on her own, mind.
They have begrudgingly said that rather than DD sh*ing in the schoolyard I might be able to take her to the toilets at the far end of the building (Year 6 area). That's next to the preschool, so I may as well just go back there, except that DD will scream the whole way about how desperately she needs the toilet and DS will protest loudly & drag his heels getting there, too.
Are adults allowed, after or nearly after school hours, in your school toilets?
There are also many heavily pregnant mums picking up children at our school, including one who is 37 weeks pregnant & walks 1.2 miles each way to the school. Presumably they aren't allowed to use the toilets either!