Since returning to school (year 2), we have been late nearly every day due to DD spending ages on the loo trying to force herself to go. She told me this morning that she wasn't allowed to go to the loo at school when she felt like it, only at certain times. If a child did manage to convince the teacher that they were desperate and couldn't hold on then they were allowed to go but they were timed and got told off if they took too long .
I haven't spoken to the teachers about it yet, and I realise DD may have got it wrong, taken it a bit too literally maybe, as it does sound a bit much for a bunch of 6 year olds.
Just curious if a similar thing happens at your kids schools. I understand they don't want kids in and out to the loo all the time, and messing about in there.