This is a quote from the guide...
You should be consulted at each step
Different schools will take account of the Code of Practice in different ways. However no matter how the school chooses to take account of the Code, if you child has SEN, you should be consulted at each step.
You have the right to see the schools SEN policy and to receive a copy of the schools annual report, which will include a report on that policy.
Your childs teacher is responsible for working with your child on a day-to-day basis but may decide to write down the actions, or help for your child, in an Individual Education Plan IEP.
Sometimes the school will not write an IEP, but will record how they are meeting your childs needs in a different way, perhaps as part of a lesson plan and will record your childs progress in the same way as they do for all the other children. But the school should always be able to tell you how they are helping your child and what progress they are making and explain why they have not written an IEP.
Remember - it is how your child is helped that is important and not the way in which the school writes it down
Sorry that was so long but it seemed relevant.
I have two boys one at SA+ and one with a statement and I would advise that it is always worth pushing the Senco for an IEP, so that you have something to focus the support on and some commitment from the school to help in some way.
It means that you can set small achievable targets and monitor if they are working or not.
Request another meeting, if the Senco won't help send a letter to the head or the governor in charge of SEN.
Good luck