Taken from EBF Rules 2023
AN UMPIRE SHOULD:
1 See that the Laws of the Game are complied with.
2 See that the game is continuous and played in a competitive and sporting manner.
3 Be available for consultations or decisions at any stage of the game.
4 Measure all doubtful and difficult shots at the request of the marker or skips.
5 Give a clear and definite decision upon any point in dispute in relation to the game, bowls or green.
6 When called upon to make any decision or measurement request all players to leave the head, not tolerate interference, and be positive in all actions.
7 Be completely neutral and unbiased.
8 Give a decision which shall at all times be final.