giloc (and others),
I don't know if you are aware of a new scheme by the British Aerobatics Assoc. There is a new type of membership available for clubs/instructors. This allows their students to enter a BAeA competition for free and without having to join as individuals. This club membership is the same price as an individual membership.
So, if you provide aerobatic training and would like your students to be able to taste a competition then this is for you.
The beginners competition is perfect for people who have just completed the AOPA course and provides a perfect stepping stone into the world of aerobatics.
More details are at:
http://www.aerobatics.org.uk/membership.htm There is a beginners competition this afternoon at Sleap.