You can print 200 copies for all it matters, but only one of them will work. If you look you will see a number, they call and give restaurant.com that number. After that the number is useless.
I was also a bit confused about the wording because it says max 2 and 1 certificate per party, which does make it sound like 2 people can get that discount, or they may take $12.50 off the price of 2 tickets. I would call the place before you went and ask for a clarification.
It is a bit pricey but the show is fun, especially for kids, and there is some audience participation. The thing I don't like about it is that they claim to offer beer and wine during the show, which you would assume to be all you can drink, but then the waitress/waiter informs you that you are only allowed 2 drinks per show. They will then "sneak" you another one, probably to try and get a better tip. Of all the Orlando dinner shows I've attended over the years this is the only one to pull a stunt like that.
If you're a big eater I would get there early and load up on the appetizers. They aren't bad and you can have all you want.
Since you're a Brit you might also want to check restaurant.com for a restaurant called
The Cricketers Arms. It's an authentic British pub with good food. We've bought several certificates and will be going there for fish and chips. It's right up the street from Pirates Adventure on International Drive.
http://www.cricketersarmspub.com/
Here is their link on restaurant.com:
http://www.restaurant.com/microsite.asp?rid=358385&mcn=00061517