For anyone who didn't watch this brilliant investigative journalism, then it's currently available online.
All of those crimes filmed in the investigation, by those who are supposedly supervised, would not happen if the criminals were in prison. The predatory paedophiles would not be befriending children if they were not released early. Whilst community based schemes may be the correct solutions for some people, in this particular case they were clearly not. This is partly due to the complete and utter incompetence of the probation service - and partly due to lack of resources.
The buck stops with you, Mr Reid. The only solution is to build more prisons.