A woman whose body was found in a river alongside that of her partner has been named as Annette Creegan, 49, from Mitcham.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
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The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants