The EHCP is supposed to fit your child not the LA banding. 
Assuming it has been done properly, The EHCNA is supposed to identify all of your child's needs and the provision required to meet each one of these needs. These should be in the reports from all the professionals consulted.
You should have been given copies of all the professional reports.Go through all of them with 2 highlighters. Highlight all of your child 's needs (eg poor organisational skills, difficulty with time keeping, slow processing) in one colour and then all the provision to meet the needs in another colour.
For example you might have a Speech and Language Therapy report which says "X has great difficulties with social communication." This would go into Section B of the EHCP. The SALT might go on to say "X needs a social skills programme devised by a qualified Speech and Language Therapist and delivered for one hour each week." This would go into Section F of the Plan.
When you have done this for each one of the reports, go through the draft plan and make sure all the needs you have highlighted in the reports are in Section B and make a record of any that have been omitted.
Then make sure all the provision you have highlighted in the reports are in Section F and again make a record of any that have been omitted.
Give the LA a copy of your records of missing information and tell them that everything that has been missed out needs be included in the final EHCP.
If any reports are vague or woolly and use phrases like "requires access to", "would benefit from," "regular" "high level of" "opportunities for" tell the LA they are not acceptable and they need to go back to whoever wrote the reports and make them more specific, so that the EHCP can be amended with the specific information.
9.51 of the Code of Practice clearly says:
“The evidence and advice submitted by those providing it should be clear, accessible and specific. They should provide advice about outcomes relevant for the child or young person’s age and phase of education and strategies for their achievement.
The local authority may provide guidance about the structure and format of advice and information to be provided. Professionals should limit their advice to areas in which they have expertise. They may comment on the amount of provision they consider a child or young person requires and local authorities should not have blanket policies which prevent them from doing so.”
Once you have your EHCP which accurately describes needs and provision, you look for the school that can meet those needs.
The LA is legally responsible for funding all the provision in Section F, regardless of any banding.