Apparently a great white was seen off cornwall once by a south African surfer who recognised it, this was a good few years ago. It's been said that great whites don't particularly like to eat humans, too little fat content, it's just the damage they do when they check us out!
A man was in boat and he asked the fisherman if there were sharks in the water "put your finger in the water, what does it taste like? salty, said the man, well there's sharks in there said the fisherman "