At the end of the campaign, the Commander-in-Chief of the Home Fleet complained that “it is most galling that the enemy should know just where our ships…always are, whereas we generally learn where his major forces are when they sink one or more of our ships.” In the final withdrawal from Narvik, the aircraft carrier Glorious was sunk by the Scharnorst and the Gneiseneu on 8 June. The OIC did not know the position of the Glorious, let alone the German warships, and learnt of the sinking from an open [German] victory broadcast.

*Or, why the Royal Navy had a love/hate relationship with Alan Turing

Andrew Hodges Alan Turing: The Enigma p238

(Chris)