A bit like gym membership, this can be great value or awful value. Anyway this 2 year pass (79.99) has an extra 2 months on it, and 5% off if you buy 3 or more.
Also, you get 2 free adult tickets (worth up to 33.98).
So if you use it every 3 months or so it's a really good deal.You'd have to use it more than twice a year for it to be worth getting I guess. It's also valid for other zoos:
'These are currently Belfast, Bristol, Chester*, Dublin, Edinburgh, Highland Wildlife Park, Marwell Wildlife*, Newquay, Living Coasts, Paignton, Rotterdam and Twycross.
(NB Copenhagen Zoo and Topeka Zoo, USA are no longer part of the scheme)(*Chester & Marwell, 1 visit only per year)'