Haven have just published the 2017 prices for the funpasses. Funpasses are needed to get into the complex to use the facilities such as the swimming pools, kids clubs and evening entertainments. They are not needed to use the supermarket, launderette, Starbucks, Mash & Barrel, Papa Johns etc.
The funpasses are purchased from reception, you just need to take the caravan key to show which pitch you are staying on.