A "worst zoos" list shouldn't be too hard to come up with, as the ZooChat gallery is littered with horrible little parks that should really be closed down. Cefn-yr-Erw, Amazona Zoo, Battersea Park Zoo, South Lakes, Dartmoor, Five Sisters, Animalarium, Mole Hall, RSCC, Southport (it's thankfully closed, right?), Shaldon, etc, etc, etc.
Great zoos in the United Kingdom? From thousands of photos, books, fellow ZooChatters, etc, I'd say that Chester looks to be fantastic and the one truly world-class zoo out of the 200 or so in the U.K. Chester can compete with the big guns in other nations, but after that...? Maybe Edinburgh...and is that it? There are some that would argue that the privately-owned facilities Howletts and Port Lympne (even with all that ugly wood and wire around 98% of the enclosures) are top notch so I'll include those and that brings the list up to 4. I'm not talking about average establishments that are more country garden estate than zoo (Cotswold), collections that are impressive but exhibits that are at times horrendous (Twycross, Bristol), or even Durrell Wildlife Trust (which could arguably be on a list of greats simply for its conservation work). London Zoo is puny in size (35 acres), has perhaps not a single great enclosure (only good ones), and almost closed down not too long ago but must be at least average compared to some of the U.K.'s other collections. However, is London Zoo even above average, let alone truly great? Monkey World, Marwell, Whipsnade and Longleat (quite popular) are probably decent and it is interesting that out of the 200 or so zoos in the U.K. only 2 have over a million visitors a year.
The United Kingdom has over 60 million people and lots of average to below average zoos, but is it really going to offend someone if I state that the excellent Chester Zoo is the one and only zoo that can compete with any of the top 20 in the United States? I am not American so there is zero patriotism involved, but several times already on this thread there have been comparisons between U.S. and U.K. zoos. There are plenty of small, crappy zoos in the U.S., but to be honest many of them have been shut down over the last couple of decades. Both the U.K. and the U.S. have lots of disappointing animal menageries, but surely Chester is the ONLY British establishment that is even in the same league as the big guns in the United States. What other zoo is as impressive? You'd have to venture farther afield (Germany, the Netherlands) to find the other great European zoos.
Top Six List (in the U.K.): is this accurate?
1- Chester Zoo (world-class, but all by itself)
2- Edinburgh Zoo
3- Howletts
4- Port Lympne
5- Jersey
6- Whipsnade