Hm, I have to agree that the rescue centre has every right to complete reasonable checks on prospective owners to ensure they are suitable dog owners. While I understand your point, twaflooers, perhaps not everyone who enquired about a rescue dog would be as experienced as a dog owner, or as capable. Checks are done across the board to ensure that the very reason the dog entered rescue in the first place won't recur.
I really feel that if somebody wants a rescue dog that much, they will be more than willing to sympathise with the rescue centres, who do a great job and are already extremely overstretched, and to jump through EVERY hoop to get the right dog for you, and the right home for that dog.
Lisa x