In my experience, UK zoos have been busy in July and August this year. The only one I visited that was not well attended was Edinburgh - but it was very cold, grey, wet day (even by Scottish standards). However, this is only my impression, the actual visitor numbers may tell a different story.
I think the effect of the recession can really be seen in the very limited development of new enclosures etc recently. Cotswold's giraffe house is the only big new building I have seen this year, they also have a new wolverine enclosure. Minor developments at Blackpool (aardvarks, penguins & sealion renovation), Bristol (Zona Brazil tamarin cage) and Chester (sealion pool redeveloped for otters). In fact Chester has reduced the number of exhibits by demolishing the old Oakfield, Bird house and round aviaries, likewise Regents Park has taken the right hand side of the Clore Pavilion off-show (or is this just temporary?).
The only other substantial progress has been at Whipsnade (enclosures constructed or redeveloped for moose, wolverine, boar & lynx) and at Colchester, which always seems to be demolishing and rebuilding - the results may be idiosyncratic, but the new enclosures are much better than the ones they are demolishing, and I applaud their progress.
I think zoo managements feel they must be cautious in case visitor number fall. Indeed I remember the Development Officer at Chester telling the meeting about the plans for Natural Vision and Heart of Africa that in the last recession the zoo had its worst year when the recession was officially over, but the recovery was only just starting. If the same pattern is followed in this recession, this year and next year could both be difficult for zoos.
Alan