I remember reading about Pat Pattle as a teenager, but I think it was one chapter in a fairly typical 'fighter pilots of the RAF' type paperback.
I seem to remember that in the case of Pattle nobody was sure exactly what his score was. Many of the records were either destroyed/lost or not kept properly in the retreat from Greece and other hectic moments.
By the way, before somebody else points it out, you should have had RAF somewhere in your title. I believe Erich Hartmann (not sure if spelling is correct) got about 350 kills in WWII.
352 actually -
http://www.acepilots.com/misc_hartmann.html