We're talking about the Falklands. 22 years ago. That's ancient history, and in view of the changed circumstances, that war represents a great case for an end to the blanket 30 year rule and for a proper Freedom of Information act.
There is no possible military reason for secrecy after this amount of time. It's like forbidding discussion of WWII SOE ops in 1966...... It happened but it was ludicrous, kneejerk secrecy run mad.