I checked both the WHSmiths and it's partner site (WHSmiths Entertainment - which sales games and that kind of thing ;]) plus the Clinton Cards website, to my massive disappointment, neither have any mention of any such cards :\
I would like to go to my 'local' WHSmiths, however I'd have to spend ~£7 just to get to where I could MAYBE purchase these upgrade cards. I'm considering purchasing a couple of these cards to get the new stuff and if I cannot get them I'll be very disappointed. I don't see why you opted to use just the upgrade cards on their own for the promotion, you have a perfectly good electronic upgrade method to use that wouldn't limit the amount of potential customers.
EDIT: Also, I live in the United Kingdom - the Bristol area.
< Message edited by entity azirius -- 3/30/2010 19:55:40 >