TD
What you say may seem logical but fully digitised data is too easily manipulated/erased. Better to retain a paper audit trail. MoD may still destroy and/or deny the existence of paper (as witnessed by at least one fatal GW2 incident, on 22nd March 2003; and almost certainly the one on the following day), but it is more difficult to manipulate and certifiable copies can be kept and produced as evidence (as witnessed by.........2003).
Don't trust them as far as you can throw them.