Basically, on promotional cans of suremen you get these codes which I only just noticed (two layer things, peel back layer to reveal code) and you enter them on suremen.co.uk. They give you a random team and if they get to quarters you get £5, semis £15, Final £25, winners is £50 cheque.
I got two cans and entered both codes and I have Italy and Uruguay as my teams; I think that is a guaranteed £5 with Italy's group. Uruguay stand an okay(ish) chance too.
So, if you buy suremen, check your can to see if it is one of the promotional cans! Goodluck with the random team that you get picked.