Hi,
A big congrats on your amazing win! I hope you have an amazing and safe time
A lovely early Chrissy pressie. Just for future reference, if you want to thank the poster but don't know who it is, simply type in a key word relating to the competition into the "SEARCH" tab on the top of the acc website. So in your case you could type in the prize name or promoter and it will bring up that web link, this will have the exact name of the poster in it. It's always nice to identify who they were, after all without that particular person we would never have won.
All the best with your luck in 2013, hope you enjoy more wins
Bubbalor