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How many "stop leaking" warnings have we published over the years. Cummings' whole Friday night briefing leaked to just about everyone. 
One of the reasons sources in SW1 leak is to get one in the favour bank for when they're in trouble or need to spin something dull. The trade-off is a bit of colour. Good luck bucking the market in gossip and spin.
Also self protection, hacks don't generally do hits on their best sources.
