Whoops - of course NT 3yos are not going to be able to get themselves to nursery, are they, so yes, the parent or CM or whoever would be there in person to drop them off 
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So in this case, people saying that the Special school (actually nursery?) should have phoned the mum to see if she had kept the 3yo off nursery that day - would they normally do this? If a SN 3yo didn't turn up to nursery, would they normally phone to check where they were?