<p>The bleak, volcanic island of Ascension, 800 miles from its nearest neighbour St Helena, was described by a Victorian naval officer as 'one of the strangest places on the face of the earth'.<br><br>It is still exceedingly odd. Uninhabited when it was taken over by the British in 1815, it was an almost perfect natural vacuum ? a triangular heap of lava and ash. When the Royal Marines brought in plants and animals, some flourished, others died. ...