indeed it was Cressida Dick who authorised the murder of Jean Charles de Menezes
Lovely choice of words there, and if it had turned out he had been who they thought he was at that time, and carrying a bomb I assume you would still be calling it murder...
The whole thing has shown up a lot of relatively small ****-ups that added up to a major **** up that led to the death of an innocent man.
Individually from what i've heard there is little evidence any one person caused the death, and certainly not one of the police officers who pulled the trigger (in the sense that they had extremely limited choice if the information they had was that he was a probable suicide bomber at that time).
And before anyone goes all tabloid about the "officers pumped XX rounds into his head, when they didn't need to", a very small amount of research taught me that head shot don't kill all the time, and even when they do it's not always instant (hence multiple shots are needed to guarantee an instant kill which is what is needed for suicide bombers in close proximity to others).
One of the most telling problems is that 15 years after the Kings Cross fire, one of the major recommendations from that, still isn't a reality (emergency services should have reliable comms that work in the underground - something the government hasn't sorted out).
As for the coroners instructions, iirc each of the possible verdicts the court can bring has a very specifc meaning (something that may not be obvious to a layman) and can I believe affect what happens next.
Unlawful killing for example might be taken to mean it was the officers who pulled the trigger that were at fault, whilst an open verdict means that the matter is still ongoing.
If the officers who killed him were following orders, and acting in good faith then the killing cannot be unlawful in that regards (if they honestly believed they had no other choice, but to kill him to prevent larger loss of life, or protect themselves - the same basic reasoning that anyone has when they have a genuine fear for their life and act on it).
As is generally the case, I would trust a coroner, or judge to know enough about the law to give instructions to the jury (something that isn't taken lightly), over ill informed guesswork from tom, dick and harry, or second guessing from reporters whose only legal knowledge might be that it's sometimes worth paying out libel damages if publishing a story brings in more sales...