A very silly move indeed.
David Cameron will pledge to restore the status of teaching as a “noble profession”, barring entry to the classroom to people with poor qualifications.
The private school system is where those without teaching qualifications (post grad degrees in education etc) can find jobs as teachers. The private school system seems to have better results.
Thus it would seem that the issue of teachers\’ qualifications is not the important one when considering the quality of the teaching.