Services at Oakhill Secure Training Centre are inconsistent, with evidence that poor practice is being institutionalised, inspectors concluded yesterday.
A Commission for Social Care Inspection probe of the centre for 80 young offenders in Milton Keynes last June found its progress had slowed since a previous inspection in May 2005.
While safeguarding had improved since the previous inspection, where this area was criticised, progress was reliant on one particular manager.
The inspection also found services at the facility, run by Group 4 Securicor, were ran in isolation with considerable scope for integrating health, education, substance misuse and other services.
Oakhill is one of four STCs in the country, all of which are run by private companies.