My ds2 is 4yo and no where near being toilet trained. He goes to nursery every morning but they do not change pull-ups. They are going on a school trip with P1/2 next week and it's just dawned on me (duh!) that as it's a full day outing he will need changed. I can't go as a helper as my 2yo dd2 is often ill and I have no-one I can leave her with. Do I have any options or will he have to miss out?