New figures show the North West has the lowest number of academies in England.
Education secretary Michael Gove says some authorities are "blinkered" in their attitude to the schools.
He said pupils are suffering as a result.
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Greater Manchester Police said "inquiries are ongoing to fully understand the circumstances of the incident."
Business Secretary Greg Clark said talks with Peugeot's boss over a potential Vauxhall takeover were both "constructive and reassuring".