Basildon and Thurrock Hospital in Essex is one of 14 hospital trusts bracing itself for tough criticism over thousands of needless deaths in a key report next week.
An NHS medical director is set to detail failings in the trusts thought to have had 'excess' death rates going back years.
The report is expected to describe poor care, medical errors and management blunders.
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British Transport Police confirmed the trio have been charged with obstructing trains or carriages on the railway by an unlawful act.
The white hedgehogs were found huddled up in a cardboard box with newspaper and a fleece.
The demonstration, dubbed #OperationShutdown, saw supporters initially gather near Downing Street.