Theoretically speaking...if a school is doing f-all for a child, and the parents apply for an EHC assessment because their child is all over the shop, the assessment can be turned down, because there isn't evidence that the school have done all they can within their ability and budget to meet the child's needs.
So, you start off getting f-all because the school are rubbish, and can't get assessed because the school are rubbish.
Tell me that can't be right?!? Am I missing something? Afterall, some schools are frankly cr%p at recognising and providing for SEN.