England is to get its first "new" grammar school for five decades after ministers allowed a grammar school to build an "annexe" in another town.
Weald of Kent school in Tonbridge will open a site in Sevenoaks, Kent - side-stepping a ban on new grammar schools.
But Education Secretary Nicky Morgan said this would not "open the floodgates" to more schools being allowed to select by ability.
Labour described the decision as a "hugely backward step".
The decision to allow the new grammar school site, with places for 450 girls, has raised expectations of similar bids in other parts of the country.
But Mrs Morgan said this was a "genuine expansion" of an existing school - describing it as "one school, two sites" - and it "does not reflect a change in this government's position on selective schools".
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