Politicians debating crime rarely expand the mind, so when I watched Stephen Greenhalgh, Boris Johnson's policing deputy, speaking wisely on the theme on Tuesday I wondered which one of us had swallowed LSD. Re-running his appearance before the London Assembly's budget and performance committee I am now confident that neither of us did - the trippy moments were matched by the usual ploddy stuff. But when he was out there, man, it was, like, wild.

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