Don't forget that this programme was filmed over a 2-3 month period to give 2x50 minute programmes.
Yes prisons are very violent places potentially and most have this rage simmering just under the surface, especially places like Aylesbury that are housing long term young offenders, but the sheer professionalism of the staff keep things in check for the majority of the time.
Where else could you expect to see a hostage situation brought to resolution in under 3 hrs with no physical (although I expect unfortunately some considerable emotional problems for the victim) injuries as part of end scenario.
Big up to all prison staff they are unsung heroes. :)
P.s. a number of my friends were in the programme tonight!!