The BBC highlights that 1 in 5 children in England are getting special educational needs support, but in my experience many are not. Usually this is because an individual’s needs have not been identified or diagnosed. You may find the attached article of use, I have also attached an article outlining how to go about getting and Educational Health and Care Plan (EHCP).
Record 1 in 5 pupils in England getting special educational needs support: https://www.bbc.co.uk/news/articles/c23mdz2728zo
What is an EHCP and how do I get one for my child:
https://www.bbc.co.uk/bitesize/articles/zfqmvj6