An Ofsted report into the Al-Madinah school in Derby found the institution to be 'Inadequate' - the lowest mark on the scale - in all four areas of assessment.
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The Royal Marine shot a Taliban fighter in 2011 and had his initial murder conviction quashed earlier this month.
The report found one man had voted twice in the EU referendum and a Tory councillor who had been jailed for submitting a false address.
Weather set to improve with plenty of sunshine by Saturday