Orders to specific airfields in France giving no's and type of aircraft, plus bomb loads were often transmitted in plain in the late afternoon of the day before the raid. This information was of significant value to Fighter Command, so much so that perhaps only Dowding was trusted with it.
Not only Dowding. Churchill too.
He was no fool. He knew when a raid was planned against central London and he almost invariably scarpered to Ditchley for the night when he knew that he would have been at personal risk if he'd stayed at Downing Street.
Warmongers are rarely brave. They get other people to do the brave bit and then they cover themselves in vicarious glory. That was Churchill's style.