The BBC reports that Battersea Park School made a complaint back in June after 'rude and dismissive' Ofsted inspectors visited to carry out checks.
The school subsequently received a critical report which claimed their teaching was 'inadequate' and that their students 'did not do well enough'.
A few months after the inspection, the number of pupils gaining five A to C grades at the school rose by 14 per cent.
The watchdog told the BBC all complaints were investigated 'thoroughly and rigorously' and that the claims that their findings were not based on evidence were 'totally unfounded'.
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