Your task here is to name every men's major champion since World War Two whose surname ends in either 'a', 'e', 'i', 'o' or 'u'.

It sounds fairly straight-forward from the outset, but this is in actual fact quite tricky indeed. For the eagle-eyed, you will know that the golfer in the silhouette is one of the 25 answers...

You've got ten minutes to guess them all. Good luck! Don't forget to share your score with us either in the 'Comments' section below or by sending us a tweet at @BunkeredOnline.