Sorry, I should have made it clear that I wasn't suggesting the OP was unreasonable, my post was in response to the posters who were implying it was never reasonable to buddy pupils and a TA should always be used. In this particular situation, the buddy system works well because the boys were good friends before Dave started having seizures, and Kevin therefore has quite intimate knowledge of Dave's epilepsy- certainly more intimate than the staff who have only known Dave as matter of months.
nomama no, the TA doesn't have to be specific to Claire. However, in a school like ours with a high proportion of SEN students that don't have a statement/attract funding, there simply may not be the staff available. In Dave's class, there are 2 TAs, as well as Dave there is a child with a physical disability, and one with ASD (who can be a danger to other children as well as themselves). If the child with physical needs is already being toileted by one TA, and the child with ASD has run off meaning the other TA needs to follow, and Dave needs the toilet, who is going to help? The teacher needs to supervise the rest of the children. Sending another child to fetch another adult means that another class could be left short, and there just isn't the funding to have a 'spare' TA just in case Dave needs the toilet at an inconvenient time.
hazeyjane no, 5 year old Kevin can't time Dave's seizure. However, a good estimate can be obtained based on the time the boys went to the toilet and the time Kevin alerted staff- he can be trusted to raise the alert pretty quickly (within say 10 seconds of a tonic clinic seizure starting). Dave's medication is administered after a length of time measured in minutes rather than seconds.
Kevin can't ensure Dave is in the correct position- but no one can until Dave's seizure has stopped. You do not attempt to put him in the recovery position until then. And an adult wouldn't be able to prevent Dave falling to the floor either.
Kevin can tell the adult that Dave isn't answering him (in fact, Kevin is much better at spotting if Dave is having an absence seizure than the teachers), or has fallen, and can deal with Dave wetting himself- in fact one of the early seizures (before epilepsy was diagnosed and the boys were very young), Kevin covered Dave with his coat so Dave would not be embarrassed, with no prompting from an adult.