I used to enjoy Colchester Zoo but in recent years it has been absolutely wrecked. There are no longer visible fences around the enclosures. For some bizarre reason they have built these awful baking hot demountable buildings where you have to fight other visitors for a glimpse through a few windows.
What is the point of a zoo where you can't see the animals?
Furthermore the signs are miniscule, they won't let people smoke (this is outdoors remember), the sea life displays are over in under 10mins which isn't even enough time to find the relevant aquarium and the staff treat the place like a personal petting zoo where the general public are barely tolerated.
If you don't like seeing animals then you'll love this place!