The EP my ds saw was initially great at helping us getting him diagnosed despite school refusing to see a problem (we self-referred via the emergency line, as he was basically having a breakdown at 7 years old).
Then when the same EP ended up being allocated EP for his Statutory Assessment it all changed. Wording was deliberately vague, there was backtracking on things they had told us about ds and his needs whilst going through diagnosis and everything basically towed the LA line to the detriment of ds.
Later, when the school failed to implement the statement once it was finalised, they sat on the fence and refused to get involved, despite the majority of his statement being written on the back of their report. In fact they went so far as to say the exact opposite about one particular area of support that they had when speaking to us previously and talking us through the statement provision. 
Finally, when ds hit a wall with secondary transition, CAMHS refused to see him as the problem was school based only, Paed said it wasn't his territory either and as a school related issue the EP should be supporting - he then contacted the EP, who still had ds's case file open at this point, only to be told he'd had all the support they were willing/able to give and they were now closing his file. Leaving us with nowhere left to turn.
As far as I can tell they were left with little choice but to protect their own position/job, as there have been high profile cases within our LA of EPs being sacked for standing up for what's right, rather than towing the party line. I do understand this, it's all very well being noble and standing up for what's right, but if it leaves your family with no income then it's not really a choice many people can make.