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The maths mastery approach, adapted from the way children are taught in Singapore and Shanghai, is proving popular in primary schools. But has it come too late to stave off a collapse in the subject’s popularity among older pupils?

In fact, the inspectorate does not endorse any particular teaching style

Teachers say they have already spent time and money planning the course

Inspectors have the power to request individual staff files

Pupils who correctly positioned a semicolon were denied a mark for their answer

A leading educational psychologist argues that, unless every inspector goes into lessons with the same checklist, they are open to ‘prejudices and partialities’