I've always been sceptical about claims of soldiers being used in the miners' strike, although I certainly wouldn't have put it past the beyond the bounds of possibility, Unfortunately, I doubt an FOI request would yield anything. That's partly because of the length of time that's elapsed since, but mainly because whoever might have been responsible would have made a damned good job of covering up their tracks. You can bet your darned tootin' there would be no paperwork trail for future investigators to uncover.

It is, to this day, common practice among police to remove their badges etc when things get rough. Just watch the news the next time there's a riot and see how many badges you can spot.