There has been quite a lot of privatisation of bits of the probation service for many years, all of it leading to funds being creamed off by contractors and serious offending being committed as a result of escalating concerns being missed by workers who don't understand what indicates high risk. Sending low risk offenders to private companies to be managed misses the point of being supervised by professionals who bring criminological, psychological, forensic and sociological expertise to the job. In recent years, short-sentenced offenders have been released from prison without any supervision, and they have high reconviction rates. The answer is to allow probation staff to supervise them, not to send them to private companies. Payment by result will hopefully show that this won't work in a very short time, unless the measures and outcomes are so meaningless that no-one has a clue whether it has been effective.
Probation is good at managing serious offenders, but more important, good at noticing deterioration in offenders who have committed relatively low risk offences. G4S are a joke - the workers who have anything about them soon leave and approach the police, prison and probation services. They arrive with horror stories of escaped offenders, wrong, incomplete or missing paperwork for suicidal prisoners, electronic tags being incorrectly fitted, bureaucratic disasters and poor staff retention, hence lack of knowledge and skills. SOVA and other chancers have not understood the importance of assessing low risk offenders, and have placed untreated drug addicts in unsupervised houses in the midst of housing estates where they have caused havoc, or they have placed vulnerable young females in all male houses, resulting in harassment and abuse, and so on....ad infinitum.
Probation should remain a public service. The training programme for all staff is par excellence, but costly. However, it can be supported with training and supervision from experienced and suitably qualified staff. The public will lose out if all this is sacrificed.