We're pointing out that A: Twycross isn't a low-quality zoo (by British, European or even global standards) and B: you seem to have a low opinion of UK zoos overall compared to those on mainland Europe.
You state that you had low expectations of Twycross and stated that "there are better establishments in the UK and many of the worlds best zoos are a short flight away in mainland Europe"... implying that zoos in mainland Europe are "better" than the even the best UK establishments.
Yeah - to argue that UK zoos are "superior" to European zoos is just as ridiculous as the other way round.
For example, I haven't heard much good about zoos in Spain - of course, part of that could be my deep-seated mistrust of institutions that keep cetaceans (I got that from my mother - it's a long story), which most zoos in Spain seem to keep. However, I've known someone who went to the biopark in Valencia and said it was fantastic.
I've never been to Cotswold or Paignton, but I would say that zoos like Chester and Yorkshire Wildlife Park can not just stand with, but surpass, the best of the continental zoos - I've been to zoos in mainland Europe and, with the possible exception of Zurich, Chester and YWP beat them all every single time.
(What did you find in Chester that disappointed you,
@SlothBear? Just curious).