Ricky Tomlinson will hand in a petition to Downing Street later calling for the release of government documents over a builders' strike which led to him being jailed. He claims the charges were politically motivated.
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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".
He served in Margaret Thatcher's Cabinet as Home Secretary in 1989 and was also a former Governor of Bermuda.