The Canadian one is closest to getting into the wild blue yonder
Expert opinion is that they're pretty neck and neck. It'll literally be down to who completes their respective parts shopping list first!
As for the Queen and Spitfire Mk Is, you could say she has two: one in the BoB hall at Hendon; t'other at Cosford. I don't know if the IWM or Science museum examples would count too?
