British Crown Green Bowling Association (BCGBA) Book of Laws of the Game of Crown Green Bowls
“Item 3.4: The result of the end shall be clearly indicated by the winner, to the two markers, except at competitions at which an official marker for each game has been appointed and official scoreboards are in use. Where there are two markers they must sit together and agree each other’s score cards every third end and at the end of the game. Where the score cannot be agreed by the markers or players, it shall revert to the end where both score cards show the score to be in agreement.”