I don't think the UK has any sort of Gold/Platinum status stuff. But I was browsing the site, and if you do this thing and then register Pokepark Wii within two weeks of it's release then you get more stars.
EDIT: OMGEEEE. I can also get 50 stars for every game I've downloaded on the DSi/Wii. That must be, like, a few thousand stars!
EDIT2: That took a while. It came to exactly 2000 stars. (: