See my post, two below yours getstuffed where I have mentioned my dd's excellent teachers.
Incidently my parenting experiences of this subject are across 3 LA's, my voluntary experiences and professional experiences, considerably more.
Schools are failing our children with SEN due to their attitudes, ignorance about SEN and the culture and context within which they work.
Teachers work within that culture. Many teachers think it is okay to disregard the contents of a child's statement because it is 'contradictory', 'doesn't make sense', 'barmy' (according to the first thread linked in the OP).
These are not reasons to deny a child their specified support and to do so is to break the law.