HMP The Verne on Portland is to close as a prison and be converted into an immigration removal centre.
It will provide around 600 additional places to hold immigration detainees awaiting removal from the country.
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15-year-old Charlotte was killed on a beach in India in 2008. Two men are on trial but her mother says she's unsure justice will be done.
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Savannah Nicholls has cerebral palsy and severe epilepsy after complications from a bone marrow transplant.