RYA PWC Instructor Certificate is valid for 5 years. After this point you must revalidate.
Further details can be seen at: https://www.rya.org.uk/club-centre-support/training/qualifications/how-to-revalidate/instructor
Revalidate online at: https://www.cognitoforms.com/RYA2/InstructorRevalidation
What if your certificate is more than 1 year expired or you have not completed 30 hours of instructing?
What if your certificate is more than 2 years expired?
First aid certificates should be refreshed or renewed every three years, other than STCW First Aid certificates which may be refreshed up to every 5 years.