parsifal
Colonel
You would have to read one of the day by day, blow by blow accounts. The best books i have on this are the series put out by John Foreman. There are others, perhaps even better than his, but if you do read them, you will see his squadron by squadron tallies give about a 60/40 kill ratio, split between the hurricanes and Spits in the RAF. The Middle East is a little more opaque, and i expect a higher percentage of kills will go to Lend Lease and the like, but given the heavy losses suffered by the LW in that time frame, i dont think it at all excessive to claim 4500 kills by Spitfires.