During the BoB some squadrons got the benefit of the IIa , 611, 66, 92 squadrons received them in August. At the end of the BoB all MkI's were relegated to OTU's and by Winter 1940 all operational spitfires were MKII.
Leutnant Steinhilper (2/JG) talks about the MKIIa in his account of the BoB professing their superiority over their E4's.
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