Scummymummy, interesting that you raise the 'top of the bottom set' case, I have seen it go both ways. I once taught a lad who was at the top of the 'bottom set' who was 8so* upset when 'promeoted' as he was having his confidnce built up by being the bright spark in the class.
Can you have behavioural probelms in the next to bottom set? You can have them in every set, give the wrong mix of personalaties. The behaviour tends to get worse as you go down the set lists. In someways second to bottom may have more 'naughty' kids.....thise who cant be bothered to work, while the very last set has more children with specific learning needs IYSWIM.
Thinking about this, we have had great sucess moving persistant troublemakers to 'top set', so it doesn't seem to have adversly affected them. We have a boy in second set atm because of his persistant bad behavior, and there is no-one there to play up with. His predicted grades have gone up fron E/D to Bs.....amazing what a good placement will do. thr trouble is you can only place one child like this is a class. Place two and you risk the education of all the others.
Agree with what you said about differentiation still being needed in setted classes, Becky, but I couldn't begin to cope with unsetted GSCE either GG to AA in a class would be impossible