In a small military plot in a cemetery on the south coast, is a single grave bearing three names: Jim, Simon, and Smith - all Privates in the South African Native Labour Corps. They died on 21st February 1917, and next Wednesday marks the 107th anniversary of the sinking of their ship, the SS Mendi, off St Catherine’s Head on the Isle Of Wight. It was the largest loss of life for non-combatants in the entire first world war.