15 weeks is also much too young to start flyball training, we take dogs at a minimum of 9 months however they are only allowed to do small amounts as there bone plates etc have no fused. I have a couple of people who travel from near you to us but if you are still trying to find a club have a look at
British Flyball Association - Home Page and on the map page you should see all your local clubs.
Christina
Allstars Flyball Team
ALLSTARS FLYBALL TEAM - Home