Sod's law of lesson observations: if it could go wrong, it almost certainly will

 Whether it's the air conditioning packing up or a technical blip, sod's law it will happen on the day of your lesson observation.
<P>The most fun you can have as a teacher – as any teacher will tell you - is to be 'observed' (checked up on, rated, judged, and maybe found wanting) – and I've been especially lucky to have this happen twice recently, first by my boss and then by a small committee of higher-ups from the organisation of which my school

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