I think, to be perfectly honest, that what they are offering is a shirt that's signed that you have to go all the way to Wincanton to pick up. As far as I know, there's no actual charge to watch the matches.
I'm trying to find out more information about this as the Waterstones competition seems to suggest that you have to pay to watch the tournament - the prize is a signed shirt and two tickets to watch the tournament.
I paid my hard-earned pound, played for UU so got a shirt anyway and asked Terry to sign it (which he did)...then the team and Terry raided the cheeseboard. (yes, we really had one...and wine, and pickles and crackers etc...)