But the National Union of Teachers general secretary Christine Blower there was no evidence to show that academy status in primary schools brings any educational benefits.

BBC: writing

"There is nothing particularly new in the idea of primary school teachers requiring more maths subject knowledge, " said general secretary Christine Blower.

BBC: Carol Vorderman says pupils should study maths to 18

Acting general secretary of the National Union of Teachers, Christine Blower, said it was a matter of "concern" that the government was keeping the Cambridge Primary Review "at arms length".

BBC: Primary education 'too narrow'