It's not as simple as SEN=EHCP. Under the new Code, there is specific provision for SEN to be met with funding but without an EHCP. It's called the 'high needs block'. The intention is that access to support should be available and that there should be no financial incentive to apply for an EHCP. EHCPs are more targeted towards provision which is specialist, whether that provision comes in the form of equipment/resources/alterations or a specialist educational setting.
All children in Special Schools must have an EHCP. Children with hearing impairment or vision impairment may well need an EHCP so that access to support, equipment and resources can be secured. However, schools should be levelling access to support for children with more common SN/SEN such as ASD, dyslexia, dyspraxia, etc.
DD1 has had a Statement (now EHCP) since she was 4 years old. Special School from the beginning. DD2 has a more recent ASD dx. Her school say that they have a whole school approach to SEN, which means that all teachers should be mindful that there may be a child with speech/ language difficulties, dyslexia, ASD, etc. in their class, diagnosed or not. When a dx is declared, the SENCO creates a pupil profile that all children are given.
DD2 is doing relatively ok right now. She has an open invitation to the SEN block at breaks, permission to see the school dog (very motivating for her) 2-3 times per day in breaks, an exit pass that allows her to leave 5 minutes early for lessons that end far away from the school entrance (she panics about missing the bus), and I can ask reception to phone across to the SEN block and they'll meet her to help her in to school (I've only used this once, and they brought the dog to meet her, emailed her teacher to say she wouldn't be in tutor time and took her for a walk around the school).
I personally think that unless there is going to be significant costly provision, then focusing on what your child needs to succeed (whatever success 'looks like' for your child) is what's important.
In primary school, DD2 had lots of provision such as pre-teaching during assembly time, so she wasn't overwhelmed in maths. Tasks broken down into little blocks. Written work scribed, then keywords scribed, then tricky words scribed, until she could write long paragraphs. None of that was even worth a diagnosis, let alone an EHCP.