Gavin Williamson (as Defence Sec at the time) seemed to suggest their should be immunity for any crimes more than 10 years ago.
There is a debate to be had on the concept of a statute of limitations - or otherwise - in the English justice system. However this is not the time nor place to have it.
It may sound very grand to strut around proclaiming that criminals can never relax and that crimes going back over half a century will be prosecuted, but it's hard to see how such actions serve justice when most people can't remember what they had for lunch last week.
In a parallel MN thread, the disappearance of Suzy Lamplugh is being discussed. Now around July 1986, I was working for a week in Fulham, but if someone suddenly decided I was a suspect, I would have absolutely no way of showing where I was (so no alibi) ...
I also have to call a bit fat hairy bollocks to the idea that England doesn't have a statue of limitations, as mysteriously the CPS managed to leave it "too late" to prosecute a policemane with assault for the death of Ian Tomlinson. It's just another one of those "heads we win, tails you lose" booby traps in English law, which make it quite clear whose justice you are getting. And it sure as hell ain't public justice.
Two things the US generally have spot on are a codified statute of limitations (which doesn't apply federally, and in most states for murder) and the fruit of the poison tree doctrine. Although I despise the casual use of jury stacking, so it's horses for courses.
With regard to soldiers and prosecutions, I have no problem with soldiers acting under lawful orders in a theatre of conflict being given a shield if immunity. The problems arise when it isn't a clearly defined theatre of conflict, and the government want to have it both ways. You are either under martial law, or not. The bottom line is soldiers should not be policing.
One of the few things I have any time for Mrs. T over, was her absolute disgust that the Iranian embassy siege had to be ended by the army not the police - and she put her money where her mouth was.