Basil,
I don't know what the group structure was at the time but surely the senior
maritime officer would have pushed for such a briefing?
I think a better question may be along the lines of:
From the paper that the Group senior maritime officer provided, articulating in great deal all of the roles conducted by Nimrod; how much of this was left in the final paper that was used to brief the minister?
Cut and paste (without the paste) - is so easy to use nowadays!