WRT meeting needs for SEN students, most students, even with ECHPs don't have a full time TA in secondary. In reality, due to staff absence etc, many will not have a TA even when the ECHP says they should.
As a teacher, I can maybe meet the needs of the child with the ECHP, at the expense of the rest of the class BUT that means others, including those with SEN but no ECHP miss out.
Certainly in my largest classes, it's very difficult to meet the needs of some students, because the room is crowded, it's to some extent distracting even during "silent work" because of so many bodies etc.
Very often, a child is one of 5 or 6 in a class with SEN needs, and so the level of support available with just a teacher is limited.
Sometimes, it genuinely is a toss up between meeting the needs of that child, and meeting the needs of the rest of the class. Which is obviously rubbish for everyone, and I don't think I always make the right calls.
But I think for inclusion as it currently is to work, something needs to radically change. And it's not training of staff, because in a perfect world, I could do it- but I can't in the situation I'm currently in.