Is this just a voucher you download and pay at park or do you pay for it in advance?
If you go in the holidays the queues are never ending... If you're willing to go on a school day it's fabulous! Rides are great and every ride and the zoo is obviously free. You can buy food there or take a picnic.
Best theme park I've been to (I've been to most)
there are often cheaper deals, think we paid around £40 last year on a Radio company deal, they dont last for long though. Daughter went with school and the queues were as you said, she probably went on 4 of the big rides all day. We went in mid September on a weekend and it was totally different, no queue on any of the rides for all of the day. Weather was great and talking to the staff they said from the end of the school holidays to the October half term was the best time to go.
Its ok but not great, we were there a few weeks ago. The zoo part is distinctly unimpressive compared to a proper zoo, and the rides are decent but not as many as you would get at a proper theme park. Parking is free, but food is mega expensive, a plain hot dog, very small portion of potato wedges and a small (think happy meal size) drink, £7.50. Not sure why the family pass can't be used differently either, the cost to get in is the same for adults or kids, 3 adults went and one child when we were there, but couldn't use a family pass. Don't see what difference it makes to the park, 4 people going in regardless if there are 3 adults and 1 child, or 2 adults and 2 children. It wasn't busy when we were there, no queues at all, however I can imagine it will be different now its school holidays!