Michael Gove

It is vital that teachers can be paid more without having to leave the classroom. This will be particularly important to schools in the most disadvantaged areas as it will empower them to attract and recruit the best teachers.

Companies selling a product play down its vulnerability and emphasize its robustness. But only after technology leaves the dock is it really tested. For human operators in control of a supposedly infallible system, complacency and overconfidence can take over, and caution may be thrown to the wind.