TORY education policies have left one in four of England’s primary schools full or over capacity, Labour reveals today as parents discover where their child will study from September.

The party’s analysis of official figures lays bare the full extent of the escalating school places crisis on national “offer day.”

The Conservative Party promised to create “small schools with smaller class sizes” in the 2010 manifesto and David Cameron has said: “The more we can get class sizes down the better.”

But some children were not allocated a place on “offer day” last year and since then the number of schools forced to overfill classrooms has risen to 23 per cent.

North-west England, the West Midlands and Yorkshire and the Humber are the worst-affected regions, with 25 per cent of schools full to bursting.

In three local authorities, Sutton, Harrow and Leicester, a shocking 50 per cent or more of schools are overcrowded.

“This government’s broken school places system means that children are being crammed into ever-larger classes and many schools are already at or over capacity,” said shadow education secretary Lucy Powell.

The situation is set to get even worse, with 295,000 more children needing school places by the time the Tories face the general election in 2020.

Yet Tory education policy means local authorities cannot build new schools and soon every school will be forced to become an academy.

Ms Powell warned: “Ministers have already tied the hands of local areas to adequately plan for school places.

“The Tories’ new forced academisation policy will make the school places system implode, as councils completely lose the levers they have to ensure there are enough school places for children.”

Education Secretary Nicky Morgan went on the offensive yesterday, issuing figures

showing 350,000 pupils are studying in primary schools that were supposedly underperforming but have become “good” or “outstanding” since converting to academies.

She claimed: “Due to the turbocharged sponsored academy programme hundreds of thousands of children are now getting a better education.”

But Ms Morgan is facing a rebellion from Conservative council leaders over the forced academisation policy, while both the NUT and ATL teachers’ unions will ballot for strike action over the policy.