Lesley try Wildlife Heritage Foundation in Smarden in Kent,you can do a photo day which will give you the chance to get really close to all their Cats.
The couple of Clouded are normally easy to see as the site is not open to the public,no screaming kids,although some grown ups are worse.
Just take a look at the website and book your day,it may look expensive but it's a one in a life time experience.
Dave