You talk about BP, but not about the RAF's Y Service who actually provided the raw intel - plus did a lot of analysis themselves.
In fact German speakers in Y were really crucial during the Battle of Britain. They listened to German chit chat and were able to provide a lot of useful tactical intelligence as raids built - given the way that the Luftwaffe spent ages assembling these massive formations of bombers before heading across the channel.
Y also were the ones to report that the Germans were packing up their kit in France, Sealion was abandoned and the Battle of Britain was actually over.
So lets hear it for the boys and girls of Y!