Thanks everyone, I did just receive a letter which asked me to call them, actually the letter was really nicely printed with Dora the Explorer on it, at first looking at it I thought it was just a advertising letter. I only referred around 4 people but brought and entered 6 packs of the cheese.
i think i entered about 20 packs of cheese (mind you no more than we usuall buy anyway!)
Have you been to the parks before?
Maybe you need someone to show you around!!!