swallowed: "i can only see that it creates a competitive and selfish attitude and 'classes' children with sen into those with loud articulate parents and those without. with the former group wanting to hog all resources for their own children at the expense of the latter."
Why is it selfish for the parent of a child who is already at a massive disadvantage by virtue of having SEN to want that child to have the support which he needs and which is set out in his statement after full assessment? The whole point of a statement is that the child isn't getting support at the expense of other children, there is funding specifically allocated for it. What you seem to be saying is that actually that child should sacrifice some of the support everyone agrees he needs for the good of others.
I am prepared to bet that there is no "loud articulate parent" who is demanding support for his or her child at the expense of other children: in my experience, what they want is adequate support for all children, including theirs, to get the support they need.