500N, my point is that it is your decision as to whether the order you receive is legal or illegal and that almost certainly it will be deemed subsequently legal anyway.
As to the Belgrano, given that British territory had been invaded by Argentina it would seem that a de facto state of war existed, though of course no such declaration had been made. Given that its mere presence (and of its escorts) constituted a direct threat to our Forces, never mind Exclusion Zones or Headings, if I had received the order I would have obeyed it. Again, it's a personal decision, it's never easy, which is how it should be. It's called doing your duty, and it's what you're paid for.