While I sympathise with the DC who are struggling with wiping while at school, I can't see how it's practical to help every child that requires help in school, unless there is 1 to 1 help for the child.
It is a skill which needs to be taught and reinforced, but if a considerable number of children haven't mastered this by the time they start school, then what?
Would 2 toilet assistants be an adequate solution if it was only one child at a time needing the toilet? (One to watch while the other helps.)
What would happen if more than one child needed the toilet at any one time? Would they form an orderly queue for the assisted toilets? How long would be too long to be queueing for a 4year old, or indeed a 5/6/7 year old? How old before it was deemed unnecessary to be wiping/changing pullups/nappies as a general rule?
I just can't see how logistically it can work for teachers/TA's to be helping a child without SN to wipe, because the child hasn't mastered this skill yet.
It is only in the last 3 years that I have heard of children entering school still in nappies/pullups. Whose responsibility is it to change/wipe these children?
Maybe the same person could be responsible for the other children who are struggling with this?