If titan prisons are back on the agenda, we must know more about the one we already have

Last week the government announced plans to conduct feasibility work on what would be Britain’s largest prison, citing a need for new capacity and a concern to close older and more expensive facilities. The government is pointing to HMP Oakwood, the 1600 place G4S prison which opened last year, as an illustration of the efficiencies achieved by prisons of this size. However Rob Allen questions whether the data for Oakwood is as clear as the government has tried to suggest.