Number of primary school infants in classes over 30 pupils has nearly doubled under the Tories, and Gloucester's Labour candidate has spoken out in condemnation.
Labour analysis of House of Commons research has found that the number of children at key stage one in classes over 30 has increased by 91 per cent since 2011.
In England in 2011 there were 43,130 children in classes over 30 but this had increased to 82,358 in 2018.
This represents 4.9 per cent of all pupils, compared to 2.9 per cent in 2011.
The analysis also found that every region except London has seen an increase in the number of KS1 children in classes over 30.
The South West has seen an 81 per cent increase, from 3,792 in 2011 to 6,882 in 2018.
30 pupils to one teacher is the legal limit (with some exceptions) for infant classes.
At KS2, the number of children has increased by 19%, from 318,515 in 2011 to 378,763 in 2018.
Labour has committed to capping class sizes at 30 for all primary school pupils.
Commenting on the figures, Fran Boait Labour’s Prospective Parliamentary Candidate for Gloucester said:
“These figures confirm the Tories’ failure to provide a high quality education for all of our country’s children.
"This situation is totally unsustainable. If Ministers really wanted to give every child the education they deserve, they wouldn’t pack so many five, six and seven year olds into classes of this size."