It's a fantastic display but makes for something of a flamingo overload! You can see my photos of the place in the gallery here.
There are four flamingo flocks - the main Greater flock is approx 180 birds, the Caribbean flock around 150, a mixed flock of 120 Chileans and 25 or so Andeans, and a smaller mixed flock including the 50 or so Lessers, a couple of dozen surplus Greaters, and the two (sadly both male) James's.
It's also very educational, of course, in a bird-spotter kind of way - all the species at hand for close comparison! Slimbridge is both a captive collection specialising in waterfowl and other wetland animals and one of the most important wetland nature reserves in the UK, so the bird-spotter in me is well catered for!
it was put on another thread that a group of pigieons were found to have newcastle disease in quarantine. So bird importaion could be done if the zoos wanted to.