The rules for completion of your induction as a teacher state that you are allowed to undertake supply teaching in periods of less than a term for no more than five years. If you are employed for a period of more than one term in an eligible institution, this should count towards your induction – and induction will take three terms in all. Further details are available in the document attached: NQT induction guidance

There is a good explanation of the key points in this TES article on induction rules.

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