The more I read about WWII, the more I am amazed at how (supposedly) effective the Intelligence Services were at controlling the information leakage from this country. It is claimed that all German spies were turned by the Brits and used to our advantage. That and a lack of air supremacy would seem to have masked all that was going on here in the UK. That's a truly incredible achievement.
All this brought to mind by the comment that the UK 'leaked' info that the V2s were overshooting London. We'd never have got away with this had we not got the information scene under complete control.
Much like the UK government would like to now, I suppose.
(Recommend R.V Jones - "Most Secret War" book for more details)