Surely these birds are kept tied down to bow perches or blocks in the daytime and moved to tiny sheds/boxes at night, sometimes just sky-kennels. Falconers have their own terminology for most things and I think these night quarters are called 'mews'. They are always in small, close accommodation so the birds can be handled. If they were released in aviaries with a decent hight, they would need to be caught by net as other birds are, and this could not easily be done every day.
I think this legislation is designed to slowly ban elephants from UK zoos, and to quickly ban falconry centres in their current form. As I said elsewhere, the only way that I can see that Falconry Centres can continue to exist, is to transfer ownership of their display birds to another individual or company which remains private and outside the scope of the ZLA, and then buy back in the services of the private falconer/company to provide the displays.
Unless private ownership is subject to the same standards, nothing has improved.
I have always thought that such shows were simply a form of modern circus, that sat awkwardly with modern zoo aims and ethics in general, and it is interesting that major players in this performing animals area like Banham, have already retracted their involvement.