The value of radar at the time of the B of B has been vastly exaggerated in places. British radio direction finding was very crude and limited at this stage in the war. Wobbly flickers on cathode ray screens, unable to distinguish friend from foe. Mercifully we had good management of vigorous airmen, sufficient to rattle Hitler’s invasion ambitions. But once the Luftwaffe commenced night-time blitz raids, there was no effective means of deterrence.
Robert Arley, Of sons and skies