And why do so many children have SEN? I mean in reality. Why do so many of our children have cognitive and/or physical issues that affect their learning?
The first thing you need to realise is the SEN and SN are not the same thing.
SEN refers to Special Education Needs, it means a child has an identified learning need requiring additional support.
SN refers to Special Needs, in other words a disability, medical condition, or long term illness requiring specific care and support.
While there is quite often an overlap between SEN and SN, they are not the same thing and are not interchangeable, it is possible to have SEN (an identified learning need) and no SN (disability/condition), and visa versa too. Not every child with SN will have an EHCP either and, while it can aid the process, a child does not need a diagnosis in order to have an EHCP.
With the lockdown last year impacting on learning it may be that there are several children in the class who have fallen behind significantly enough for them to have been identified as having a specific learning need and to have been added to the schools SEN register, meaning they need additional support in order to progress or catch up.