Data comes as government prepares to publish plans to overhaul Send system in England Data comes as government prepares to publish plans to overhaul Send system in England One in six autistic pupils have not been to school at all since the start of this academic year, according to a new survey which found that mental health issues were often behind high levels of school absence. Nearly half (45%) of the parents and children who responded to the UK-wide survey by the Ambitious About Autism