
It's a free prize draw, so you don't have to make a purchase to enter, you can just sent them a postcard - the address is listed in the 'no purchase necessary' section of the terms and conditions.
http://www.ribena.co.uk/95percent/
The site also has tips on growing blackcurrants and an email reminder system that will send you emails when it's time for pruning or whatever.
Only open to UK residents, I'm afraid
