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Thanks to the Ombudsman, we now know the identity of the staff member in the Prime Minister's office who was briefed by the SIS over its release of classified material to Cameron Slater: (former) Deputy Chief of Staff Phil De Joux.

Its unclear at this stage whether de Joux himself asked for the briefing or whether someone higher up did - but either way it suggests that dirty politics went right to the top of the Key government, and was almost certainly known about by Key himself. To point out the obvious, a deputy chief of staff doesn't receive a briefing on the release of classified material and not tell the Prime Minister. Which makes the next question what did Key know and when did he know it?