I've just visited Puxton Park. I was let in without the need of an accompanying child or someone dressed in a sailor's suit and I got to keep the sweets to myself.
For anyone interested, this is a farm park with about half of the area used for rides aimed at younger children and paddocks for farm animals taking up most of the rest. Non-domestic animals are restricted to a falconry courtyard with the usual line up of peregrines, kestrels, barn owl, tawny owl, Eurasian eagle owl, red-tailed hawk, lanner falcon and a raven. The birds are kept in quite spacious aviaries as apposed to being tethered to a perch. There are enclosures for meerkat and porcupine near a large agricultural barn. The barn itself contains pens for pigs, sheep, alpaca etc. There is a room for small domestic pets which has two flight cages housing Greater Sulphur-crested Cockatoo, Orange-winged Amazon, a hybrid cockatoo (C. alba x C. mollenis) and domestic budgies. Also with-in the barn is an area called 'Monkeys and crazy animals'. Here there are vivaria containing Golden gecko, Berber skink, Herman's tortoise, Golden Tree Frog, Fat-tailed Gerbil, Common and Geoffroy's Marmoset, Lesser Hedgehog Tenrec, a mouse labelled as Egyptian Spiny Mouse Acomys chudeaui and a lizard labelled Lacerta agama. There are also a number of inverts on show.
So, no opossom, of course it might have been off show but there was no-one to ask so maybe I'll try again after the coronavirus business is over.