This was looked into a few months ago when charges were being considered against a former Govt Minister. As I recall, the charge of gross negligence manslaughter can be made against MoD, Ministers etc. For private companies I believe the charge is corporate manslaughter. Interested in the views of any legal eagles, there may have been some changes to the law since.
BTW all that is required is 5K to kick off a case against the former Minister. If anyone has a spare 5K lying around please PM me!
The interesting aspect of Haddon Cave's report is its status. It cannot be challenged. I wouldn't like to comment on the specifics of the news story in the above link, but it must be very worrying for those named individuals because the evidence is so damning and so clear.