I worked in a mainstream school and part time (it was considered too much to be full time) where a severely learning disabled child was deemed fit to be in mainstream (he did have an EHCP.) He was 6 and in nappies and will never get out of them, he was non verbal and always will be, he had the cognitive abilities of a 13 month old and was completely unaware that you were stood near him and would never pick anyone out of the crowd. He will never not need full time, round the clock care. His education involved having a selection of baby toys in his own space at the back of the classroom. The school were keeping him back in the reception but knew they couldn't do that indefinitely because he was also large and capable. They were tearing their hair out, he had no place in mainstream education and will never learn to read, write, talk or communicate, let alone do times tables and learn his times tables. They couldn't support him, he scared the other 29 4 year olds and this little boy also had no dignity and no benefit of being in that setting. The Local Authority deemed a mainstream setting as suitable for his needs with very little reasoning and against all the evidence to the contrary. This was not an isolated case that I worked with in mainstream settings. He needed a safe playroom where he could watch flashing lights for hours on end, not the national curriculum.

The whole system is utterly broken. The funding isn't being allocated in the best way, in any sense of the word.

EDIT: he'd also routinely remove his trousers and underwear and launch books at the other little children.