Hmmm. I think the families of the murder victims might view it as being more than a storm in a tea cup.What terrrorist Attack? Dean Haydon declared it a terrorist attack. He's not a police commissioner, not an assistant police commissioner but a deputy assistant police commissioner. I suppose only a junior deputy assistant police commissioner would be a lower form of commissioner. In consequence Counter-Terrorism Policing South East will be taking over the investigation, probably pleased to have something to do to make them look important during no terrorist activity lockdown.
The details show it to look much more like the action of a deranged man and I won't be at all surprised if he ends up in a mental facility, ending another jobsworth created storm in a teacup.
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Deranged / terrorist? Not really any difference.