The state system have to find him a place.
Apply for a statutory assessment.
This is a nonsense, worry.
You can HE and it can be fantastic, but it is not your only option. The state have a duty to educate him, and they WILL do so.
I do not understand why you think they won't.
The private sector are usually pretty shit with sn (there are exceptions) but State has no choice.
Presumably you have applied through the normal application round for a yr r place. Which school were you allocated? This is the school he will go to. If this school think they cannot provide support within the normal SeN provision, then they must apply for stat assessment.
HE if you want to, but don't say that state have said no.
If they have said no to statutory assessment, then the local school have to take him on the normal application process. If he has had SA and no statement of sen issued, then the local school have to take him on the normal application basis.
If he has had SA and been given a statement, then there will be a Named School.
Have you applied for statutory assessment?
Have school or nursery applied for statutory assessment?
If you genuinely have no freaking clue what I am talking about, call your LA and ask to speak to the Area Inclusion Officer or the SN bod that deal with EArly Ears in your area.
They will talk you through it.
But don't say state won't have him, because it is complete and utter bollocks.
As the parent of an sn child, you have to educate yourself about how the system works.
You can do that and choose to HE (all good ) but you CANNOT abdicate responsibility and claim the state won't have him.
It is completely wrong. And illegal. And probably means you haven't understood your role in the application process.