An very impressive and detailed 339 pages document about U-2, her flights, and her sucessor A-12/Oxcart, with some comments of Chris Pockock:

http://www2.gwu.edu/~nsarchiv/NSAEBB/NSAEBB434/

Big revelation in there about RAF pilots flying a few U-2 missions; including the one that discovered the Blinder.

Now with a little while to read or at least perouse it.

Chapter 5, page 214, highly trained U-2 pilot used at least one time to pilot a rebel P-51 Mustang based in the island of Morotai (in 1958?) against Indonesian government bombers described as of "Czechoslovak manufacture" (Il-28 Beagle?, most probably A-26 or B-25 if the year is actually 1958, the Il-28 were received only from 1961).

 

I see a lot of elements from the records is now translated in the Wikipedia article about U-2 Dragonlady.