I'm not sure about the UK , but here we have animal rights activist groups that would have a hay day in that place . First of all , what I saw on the surrender page was they are actually telling people their birds will be happier with them , so they throw a guilt trip on the people . Second , you all say the conditions are over populated , so a sanitation law might be in an avenue to look at . Also the breeding situation , what are they doing with the baby birds? How is this organization funded . I guess you might check with animal housing or talk to a local zoo , to see if they have a comment .Perhaps a parrot club , if you have them in the UK.... I don't know .
Mary