These are the regulations for PWC use in Anglesey-
To operate a personal watercraft you must:
- unqualified people must be at least 18 years of age to operate a personal watercraft
- be 15 to 17 and possess a RYA certificate of competence for personal watercraft
- be 12 to 14, possess a RYA certificate of competence and operate under direct adult supervision. The definition of “supervision” is such that the adult is present on the craft.
Young people under 12 years of age are not allowed to operate a personal watercraft.
Full details here – https://www.anglesey.gov.wales/en/Residents/Maritime/Power-driven-craftpersonal-watercraft-launching-and-registration.aspx