The nicks I worked In were In Litchfield, and 2 in Featherstone. One for grown ups, and the other 2, YOI nicks.
The north/south divide was quite noticeable in the 70's/80's but diluted in the later years.
The division line was Birmingham(ish), North of Brum BOSS, South of Brum GUV.
Prior to Fresh Start, the opening of the Prison Service College near Coventry etc etc. It used to be said that SCREW's were trained at Wakefield and OFFICERS were trained Bristol.
Once the Prison Service College was opened a lot of Northern Officers were shipped down south and as a result of overcrowding up north, so were a lot of Villains.
My wing in an establishment down south used to have phases where we were totally full of Northern Villains shipped out due to the overcrowding.
Having 51 cells full with 102 Scouses who wanted to be back in the 'Pool' was interesting especially when you threw the red/blue unfriendly rivalry in to the mix.