How many of theses places have a flying Mosquito? None, so I don't see your point as I was talking about airworthy aircraft not static aircraft.
There are heaps of airworthy aircraft at the locations I mentioned, not a Mosquito but many others that are equally unique, many single flying examples such as the B29 mentioned above. The CAF has about 150 aircraft, with around 100 airworthy at any one time - hardly a static collection. The Shuttleworth Collection has some unique airworthy aircraft, such as the Bleriot, as does the IWM at Duxford. Then there is the BoBMF's Lancaster... the list goes on.
The point is that there are plenty of places elsewhere in the world that have equally rare collections of airworthy aircraft...