"British prison abuse and torture in NI" - a lot of that is republican propaganda and lies - they are very good at that. They were'nt tortured or abused, Bobby Sands et al., starved themselves.
In fact the British military in N.Ireland were so damned constrained by rules and regulations set in place to prevent abuse etc.. that it constrained their operational effectiveness.
Pity the IRA did'nt follow the same rules. They claimed to be in a war, I did'nt see them wearing a uniform or adhering to the geneva convention. Bob Nairac - case example. The PIRA are a funny bunch. They murder 5 british soldiers and as soon as one of them gets it they claim torture and abuse.
Take a look at the Loughgall incident.