Richard Adams:

Philosophical discussions about truth, fairness or kindness appear to give a small but significant boost to the maths and literacy progress of primary school pupils, although experts remain puzzled as to why.

More than 3,000 pupils in 48 state primary schools across England took part in a year-long trial as part of a study named “philosophy for children”, and found that their maths and reading levels benefited by the equivalent of two months’ worth of teaching.

A Durham University evaluation said the results showed faster rates of progress for pupils eligible for free school meals, suggesting that the technique could “be used to reduce the attainment gap in terms of poverty in the short term”.