OK - I've managed to set up a Game Center Leaderboard etc and I now have the following that adds highscores:
The highscore adds to the leaderboard, however it doesn't add automatically - If I first get a highscore of (for example) 10 and add that to the leaderboard thats fine. However, if I then get a highscore of 15 and add that, the leaderboard doesn't update, unless I go out of the leaderboard and then go back into it - where it's then updated.
Is there a way to get the leaderboard to update directly on Highscore submit, rather than having to go out then in again?