Just got an email back from the Sky+ HD party sign up, was this for the free £10 bet and looks like it could be used by everyone i'd think?
Free £10 Sky Bet:
Your free £10 Sky Bet consists of a free £5 win single bet for England v USA on 12th June & a free £5 win single bet for the World Cup final on 11th July.
To claim your completely free £5 bet for England's first game on 12th June you must first register at Sky Bet. Once registered simply click on "My Account" and in the "Free Bets" section enter code: PARTY
Your code for your second completely free £5 bet for the World Cup final on 11th July will be e-mailed to you closer to the event, no later than the 7th July.