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Parents of pupils at Hanson Academy have been leaving furious messages on the school's Facebook page.
She told the BBC that in order to make the school a "better and richer" place it was necessary to get "the foundations right".
One woman, interviewed by the broadcaster, said that her son had been sent home but his shoes had met the criteria of being "black shoes...flat soles, they're exactly what they say." When asked if she'd be able to afford a new pair, she said: "Not really, not on income support."
The school has been placed in special measures and has had six headteachers in five years.