The female police officer who was arrested over alleged media leaks about the "plebgate" affair was present at Downing Street during the time of the incident in September, the Metropolitan Police said.
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A bronze drum, alongside a plaque for Fusilier Rigby, will be located at Middleton Memorial Gardens.
The desk, where the author wrote Great Expectations and his last, unfinished novel The Mystery of Edwin Drood, will go on permanent display.
We spring forward an hour at 1am on Sunday, to mark the start of British Summer Time.