My initial response was the same as yours, Scooby. However further investigation suggests that teachers' employment contracts are set up such that termination by either party can only occur at the end of a term, i.e. on 30 April, 31 August or 31 December, and that required Notice Periods come forward from those dates. This is not merely specific to redundancy - which is just one of various reasons for fair dismissal - it is generic to teachers' terms of employment.