I gather that the MoD is in a state of terror right now, with phone records and emails being trawled to find the guilty party. And whoever did this has such a crude understanding of media spin that they might well have been stupid enough to be caught. But in the history of Whitehall leak inquiries, the guilty party has never been discovered.
Those who have spoken to Fox this morning say he is in a state of apoplexy. Whoever leaked this badly miscalculated if they thought this would help either him, or the defence budget.