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6 prisons are to close in England, the Ministry of Justice said as it unveiled plans to build a so-called super-prison.
Some 2,600 offenders are held at the prisons targeted for closure, plus three sites which will be partially shut down.
Prisons at Kingston in Portsmouth, Bullwood Hall, Canterbury, Gloucester, Shepton Mallet and Shrewsbury will close, while Chelmsford, Hull and Isle of Wight will see some accommodation reduced.
A feasibility study on what would be Britain's largest prison in London, the North West or North Wales, holding more than 2,000 prisoners, is also to begin, the Ministry of Justice said.
The programme is part of a drive to build new capacity to replace older prisons and bring down the cost of the prison system. It is expected to save £63 million a year.
Justice Secretary Chris Grayling said: ''We have to bring down the cost of our prison system, much of which is old and expensive.
But I never want the courts to be in a position where they cannot send a criminal to prison because there is no place available.
So we have to move as fast as we can to replace the older parts of our prison system.''