All stays as Platinum as there was no Spire at the time.
Crowne Plaza Crawley, UK: no advantage.
Crowne Plaza Melbourne, Australia: no advantage that I know of except sometimes fruits / wine in the room. Sometimes an "upgrade" to the deluxe room if I book the most basic one, but nothing guaranteed. Definitely no free breakfast. I don't think the hotel has a club lounge.
Crowne Plaza Xiamen, China: club room with club access. Possibility to have breakfast at the main restaurant.
Crowne Plaza West Hanoi, Vietnam: club access + suite, although I don't think the suite is guaranteed (lounge is for platinum). I think it's also possible to eat at the main restaurant.