So..... For some years you had to have a degree, of some sort, to get into teaching.
Whether you got onto a PGCE course with ones particular degree was up to the PGCE provider. Whether they thought your degree subject was acceptable for the subject (or age if junior/infant training) you were aiming to teach.
I think degrees are required for the various other routes into teaching - teach first etc etc.
There was a scheme to get non-degree ex-soldiers into teaching but whilst it collected some publicity it produced very very few teachers.
In the mid/late 70s it was still possible to get into a teacher training college with just O levels and qualify to teach. A 3 year course with a Certificate of Education at the end. Most will have retired by now but there will still be a few out there.
So the above is about QTS. Actually being qualified to teach.
So getting a job.............
In a state school (Local authority) you have to be a qualified teacher to teach. Whether they accept your degree for the subject you aim to teach is up to them. This may be stated in the advert/job description or decided on the day after weighing up all the interviewees.
In an independant, academy, free school - they can appoint anyone they like QTS or not.
Too many non-QTS 'teachers' in an academy or free school and results/teaching/behaviour are questionable then OFSTED may comment. But only after an inspection.
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To the writer on about p8 who was roped into teach Electronics. Sorry if it was my lessons, my school after my retirement.
I wasn't directly replaced - no applicants with my/this specialism.
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To those who are banging on about the need for higher degrees, Masters, PHD etc
My DW was involved in training prospective IT teachers. All with post grad qualifications in the subject.
Fortunately for your children many did not either get onto the course or finish it.
A real demonstration that a good degree in the subject does not necessarily equal good teaching in that subject.