Two plastic boxes, one with a German flag and one with their opponent's, are lowered into Paul's tank at Sea Life, each with a tasty morsel of food inside.

But when those from central England are compared with North Frisia, on the German North Sea coast, the "central English and Frisian samples [are] statistically indistinguishable".

The further cataclysm that gave Raeder his burning, hard-eyed religion was the dying days of the war, when the German Navy was ordered out to sea-and men mutinied.