- Roughly what percentage of qualified teachers currently teaching would you consider to be 'bad' teachers?
In my school, maybe 3-5%.
- Does the system allow for these 'bad' teachers to be removed easily?
In 14 years' teaching, my experience has been that poor teachers - as in, teachers that shouldn't ever have qualified - almost invariably find their situation to be untenable & jack it in fairly quickly. Being a rubbish newly qualified teacher is utterly miserable. Hence the loss of 1/3 of teaching staff within 5 years of qualifying!
It's rare for poor teachers to cling on as far as the formal competency stage, but once they do, the process is slowish but inexorable (usually still resulting in resignation rather than the actual boot).
- In the case of shortages of qualified English and Maths teachers, would you prefer to seek qualified teachers from overseas or would you prefer to let unqualified people in this country with appropriate skills do the job?
That's a bit hypothetical as we're unlikely to have any such shortage, given current levels of unemployment. Not least amongst qualified teachers. In the event of us all being mysteriously kidnapped or something, I'm sure it would make sense to train replacements.
- In the case of temporary absences, would you prefer a class to miss a lesson or would you prefer to let unqualified people with appropriate skills do the job?
Neither of these happens in most schools. In the event of planned absences, the teacher prepares work which the class can get on with under supervision from a Cover Supervisor; if the teacher has fallen under a bus, the Head of Dept. sorts out the work.
There's no shortage of available fully qualified teachers to cover longer terms of absence.