Re-reading vogelcommando's original title for this thread, here is a list of closed collections which I have personally visited - I think it is complete, but will add any others which I might have forgotten:
1 - Glasgow Zoo
2 - Basildon Zoo
3 - Mole Hall Wildlife Park, Saffron Walden
4 - Wellplace Zoo, Ipsden,
5 - Gatwick Zoo, Charlwood, Surrey
6 - Coome Abbey Bird Garden, near Coventry
7 - Bridgemere Wildlife Park, Nantwich
8 - Midland Bird Garden, Bridgenorth
9 - Stagsden Bird Gardens, Bedford
10 - Lilford Hall Aviaries, Oundle, Northants
11 - Clopton Bird Gardens, Oundle, Northants
12 - Pheonix Tropical Birdland, Cowbit, Peterborough
13 - Peakirk Waterfowl Gardens, Peterborough
14 - Thorney Wildlife Park, Peterborough
15 - The Brambles Pheasantries, Houghton, nr St Ives, Cambs
16 - Guilsborough Grange Wildlife Park, Northants
17 - Coton Manor Gardens, Northants
18 - Smallborough Waterfowl Reserve, nr Stalham, Norfolk
19 - Kelling Park Aviaries, Holt, Norfolk
20 - Cromer Zoo, Norfolk
21 - Birdland, Cromer
22 - Norton Bird Gardens, Bury-St-Edmunds
23 - Birdland, Bourton-on-the-Water
24 - Norfolk Wildlife Park
25 - Kilverstone New World Wildlife Park
26 - Wicksteed Childrens Zoo and Aviaries, Kettering
27 - The Otter Trust, Bungay, Suffolk
28 - Springfields Gardens, Spalding, Lincs
29 - Leeds Castle Aviaries, Kent
30 - Penscynor Wildlife Park, Neath
31 - Tropical Bird Gardens, Rode
32 - Padstow Bird Garden, Cornwall
33 - Clee Hill Bird Garden, Shropshire
34 - Flamingo Gardens Zoological Park, Weston Underwood, Olney
35 - Flamingo Park, Seaview, IoW
36 - Tropical Bird Gardens, Ventnor, IoW
37 - Robin Hill Country Park, IoW
38 - Palms Oasis, Stapeley
39 - Sladmore Gardens, High Wycombe
40 - Chestnut Centre, Chapel-en-le-Frith
41 - Westcountry Wildlife Park, Cricket-St-Thomas
42 - Southport Zoo
43 - Guernsey Zoo
44 - Wassenaar Zoo, NE
45 - Dierenpark Wissel, NE
46 - Limburgse Zoo, Genk, BE
47 - Butterfly and Wildlife Park, Long Sutton