The Big House
Jail or Gaol or Chokey or Prison
Interestingly, if you tried to keep prisoners (i.e. convicted felons, kiddy-fiddlers, granny-bashers and common-or-garden crooks) in the same conditions that soldiers are expected not only to endure, but BLOODY WELL PAY FOR, you would be in doodoo up to your neck with the human rights mob!
The Big House is also a euphemism for HQ ARRC in JHQ, Rheindahlen. The Big House is - perhaps unsurprisingly - a large building packed full of REMFs who have to send their dhobi forward when on operations. It is also the haunt of thousands of scaleys and loggies, all of whom spend huge amounts of time bitching on ARRSE - it seems.