Can we just clarify that they are separate organisations and you do not need a TTE (or any other membership of any other body) to participate in a VETTS event or a VETTS event in partnership with another organiser.
The only membership required for VETTS events is our own £15 a year.
TTE membership is required for other non-VETTS events like (Veterans) British League and Grand Prix/4*stars etc, plus affiliated leagues. Please check this on TTE's website or with your local league or club.
See our website http://www.vetts.org.uk under Membership for more information.