Obviously we've got different quotes. Interesting though, will try and find other sources, but this is the main source I have.
There were examples of the US recalling loaned Lend-Lease equipment, one being when the USAAF took over some of the P40s delivered to the RAF for use in North Africa (with shark mouth markings). ....
36 were diverted to China for use by the AVG. Britain released a total of 100 Tomahawks to the AVG which adopted the famous shark's teeth nose emblem originating with the RAF which used the markings on its Tomahawks in North Africa.
I'm sure Furball can find out more about the P40 in the piccy he took, he works at the RAF museum so hope he can find more gen out.