"Closed shop!! What, like hospitals, accountancy firms, courts of law etc etc etc? "
Um, yes. Precisely.
Although I think teachers flatter themselves when they imagine an unqualified teacher is much like an unqualified surgeon.
One would hope that anyone bright enough to be a teacher would see the vested interest qualified teachers have in restricting work to qualified teachers.
I do very much agree with your point about top-set pupils, from both a practical and ideological pov. The idea that top-set pupils either need or deserve a better education than their less academic peers is anathema to me.
I'm interested in what type of qualification we're talking about. I think at secondary school I would be more concerned that the teacher had a relevant degree than a PGCE. At primary I would think a teaching degree would be desirable.
Does anyone rate the PGCE as a qualification? There seem to be a lot of crappy teachers getting through it.
I accept that subject knowledge does not a teacher make, but neither IMO does a PGCE. At least the subject knowledge is a useful prerequisite.
Classroom experience is invaluable.
Someone earlier mentioned long-term commitment to teaching as bring important. I'm conflicted about that - experience counts for so much, but I certainly wouldn't want to rule out talented individuals who just want to teach for a while.