How would you police it?
Teachers only need a GCSE pass in English.
To become a teacher in England, you typically need the following qualifications:
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GCSEs: You must have at least a GCSE grade C/4 in English and mathematics (or a science subject if teaching primary).
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Then you have TAs.
To work as a teaching assistant in the UK, you typically need GCSEs in English and Maths, a recognised teaching assistant qualification (Level 2 or 3), relevant experience, and an enhanced DBS check.