EHCP for social, emotional and sensory support

My son , who is in year 5, struggles with social, emotional and sensory support at school, which in turn has resulted in bullying.  We are liasing with his school to resolve the bullying issue.  

Thinking ahead to secondary school, I am considering an EHCP, however, he is above average in many of his subjects, therefore support would be for social and emotional, as well as sensory processing, which he struggles with.

I have tried to contact IPSEA but it is difficult to get an appointment via their advice line.  

I would be interested to know if anyone has succeeded in obtaining an EHCP for the above issues?  rather than for academic support.