The event organiser, Sussex 7s Series, has the legal responsibility to tell ticket buyers and event attendees how their personal information will be collected and used. You can find their Privacy Policy below or contact them to request it.
Please read the Sussex 7s Series Data & Privacy Policy here https://www.sussex7sseries.com/data-privacy-policy
The Sussex 7s Series is not liable for any 3rd-party policy when you use their services.