No MissG, I am talking more about providing target information to the Germans such as the (my myth - not real example)2000 people underground headquarters under Vale Park.
One method used to transfer this duff information was to put bits of notes on airplanes that were on high risk missions, it would look like these notes were real and genuine should the airplane come down in enemy territory, this has been used in a few films.
Loads of radio signals gave tiny bits of information that could be put together piece by piece by the germans, again this was leaked False information.
Sometimes even the BBC News
was used to leak information by a passing mention of things in other News
articles - eg the road was flooded here after the recent heavy usage, implying there was convoy traffic in a location where in reality there was nothing. But this sort of information would plant a seed, a bit more information from somewhere that backs up the story would make it look kosha - a suspicious blob on an aerial picture nearby and next minute it would appear on a target list.