'You really don't get it do you? 121 is not always in the best interests of the child, only the people working with the child will know when it is and when it isn't. It is their duty as professionals and human beings to do what is in the childs best interests.'
No. You don't get it pass. Are you a teacher?
A teacher has no business overriding the quantified and specified provision in a statement. The child's 'best interests' have been identified in careful and in depth multi-agency assessments by people who specialise in SEN and education, and the provision is made for that.
Once written into a statement as the child's needed provision, it is protected by law and no teacher has the legal right to use that provision flexibly, even if they believe it is in the interest of the child to do so.
If teachers could so easily make those kinds of judgements there would be no point in the multi-agency assessments or statement.