The number of giant primary schools has grown eight-fold under the Tories.
In 2010 there were just 16 so-called Titan schools with at least 800 pupils.
There are now 129, holding 119,457 children. Of these 22,249 are being taught in schools with more than 1000 pupils. There were none in 2010.
Experts warn bigger schools can put financial efficiency first and be intimidating for new pupils.
Labour brand the growth in such huge schools a “disgrace” and put the blame on underfunding.
Shadow Education Secretary Angela Rayner said: “Rather than fix the problem and give schools the funding they need, the Tories continue to invest millions in their grammar schools vanity project.”
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Alan Smithers, Professor of Education at the University of Buckingham, said while larger schools “appear to be a good idea in terms of financial management ... it’s not looking at it from a young child’s point of view.
“The child is leaving home, it’s a very big step not to be with mum and the rest of the family.
“If you’re in a small school you can get more personal attention, it’s more family like - all the teachers will know who you are and be aware of your emotions and difficulties.
“But in a larger school you can get lost among all the children.”
He suggested more pupils means more money because of per pupil funding.
But Leon Choueke, head of a large primary in North London, with more than 800 pupils insisted
“children’s well-being not cash is at centre of our decision making.” He added that they faced “financial challenges” and are “by no means better off because of our size.”
However Dr Mary Bousted, of the National Education Union, said the “nonsensical” system had to change.
She explained: “Councils cannot open new schools of their own and have no powers to instruct academies to expand their intake.
“This makes it very hard for local authorities to respond effectively to changes in pupil numbers locally.”
She urged the Government to let councils open new schools - and provide the needed funding.
However the Department for Education insisted class sizes are what matters. It said: “Despite an increase of over half a million [at] state-funded primaries in England between 2010 and 2018, class size has remained stable. We are on track to create one million places.”
