Geograph - photograph every grid square

In WW2, 100 Group RAF was responsible for a series of secret operations involving the development and testing of more than 32 different devices. The specially equipped aircraft of this group flew within the bomber stream, using electronic jamming devices to disrupt enemy radio communications and radar, allowing the RAF fighters to home in onto the enemy aircraft, and shoot them down or at least disrupt their missions aimed against the allied bomber streams. By the end of the war the group had played a huge part in reducing the effectiveness of the Luftwaffe night-fighters and ground defences.