The rules governing the sport of water polo are determined by the Fédération Internationale de Natation (FINA). Full up to date FINA rules can be found here
University water polo competitions in the UK are provided by 2 organisations...

Great Britain finished 9th at the European Championships after winning a fierce battle with Serbia 10-9 (1-1, 3-3, 3-2, 3-3) in their final game. Winning 4 games on the bounce, the Great Britain showed great resilience after 2 tough opening matches.
Theo Nousios’ side had to dig deep in their final game– and survive a four-minute exclusion – to earn the narrow victory and end their campaign on a high,