Autism diagnosis

Hi

 

My son had an assessment for asd yesterday. We await the results. He was expedited up the waiting list by two years due to suicidal talk. My ex...his dad attended the assessment but says a diagnosis would bring a label but no more benefit than having an ehcp....(of which we don't yet have...and have not even started applying).

I know schools sre legally bound to step up to provisions if a child is diagnosed autistic...does this legal binding apply as strongly with extra support in schools with sen if a diagnosis is not present? I am.trying to demonstrate to my ex how important a diagnosis is. Thanks